Ajoene

Ajoene at a Glance

Ajoene is a sulfur-rich organosulfur compound from garlic — chemically a vinyl disulfide sulfoxide, formally (E,Z)-4,5,9-trithiadodeca-1,6,11-triene 9-oxide. It is not something garlic stores. It is a rearrangement product of allicin: three molecules of allicin condense and rearrange into two of ajoene, a reaction that runs readily in oil or organic solvent and barely at all in the watery interior of a crushed clove ^{1,3Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.

That origin is the whole point of the molecule. Because ajoene forms downstream of allicin rather than alongside it, it is a marker of macerated and oil-based garlic preparations, not of fresh garlic — an HPLC survey of commercial garlic products found ajoenes only in products containing garlic macerated in vegetable oil, and not in cloves, garlic powder, steam-distilled garlic oil, or aged garlic extract ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.

Its distinguishing property is stability. Allicin is famously short-lived; ajoene persists, which makes it the more plausible carrier of any systemic effect from an oil-macerated garlic product ^{1,18Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →Reference 18Ledezma E · 2006ReviewAjoene the main active compound of garlic (Allium sativum): a new antifungal agent — reviewView study →}. Its best-characterised pharmacology by a wide margin is antiplatelet — it blocks fibrinogen binding to the platelet GPIIb/IIIa receptor at sub-micromolar concentrations and suppresses thromboxane formation ^{5,6Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →}. That same property is its main safety caveat.

Ajoene vs. Allicin

The two molecules are constantly conflated in popular writing about garlic, and the differences matter.

Allicin is the thiosulfinate generated the instant a clove is crushed, when alliinase acts on alliin. It is intensely reactive, gives fresh garlic its pungency, and decays within hours — into diallyl sulfides, vinyldithiins, and ajoene, depending on the solvent it decays in ^{3,45Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →Reference 45Shang A et al. · 2019ReviewBioactive compounds and biological functions of garlic (Allium sativum L.) — reviewView study →}.

Ajoene is one of those decay products. It is:

• Stable, where allicin is not — it survives storage in oil and can be isolated, weighed and dosed as a defined compound, which is why it is the garlic molecule that has actually been taken into human trials ^{15,17,18Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →Reference 18Ledezma E · 2006ReviewAjoene the main active compound of garlic (Allium sativum): a new antifungal agent — reviewView study →}.
• Oil-soluble, so it partitions into the lipid phase of a macerate rather than staying in garlic juice ^{3,4Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →Reference 4Ferioli F et al. · 2020Comparison of two extraction methods (high pressure extraction vs. maceration) for the total and relative amount of hydrophilic and lipophilic organosulfur compounds in garlic cloves and stemsView study →}.
• Preparation-specific, so its presence tells you how a garlic product was made ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.
• A different mechanism of antiplatelet action — allicin and the thiosulfinates account for most of the antiplatelet activity you can measure in a fresh garlic extract ^{13Reference 13Cavagnaro PF et al. · 2007In vitroEffect of cooking on garlic (Allium sativum L.) antiplatelet activity and thiosulfinates content — in vitroView study →}, whereas ajoene acts through a defined, irreversible interaction with the fibrinogen receptor ^{5Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →}.

The honest framing for the whole page: ajoene is chemically the more tractable garlic molecule, but the human clinical record for garlic — blood pressure, cholesterol, platelet aggregation — belongs to whole garlic preparations, not to ajoene ^{43Reference 43Mollahosseini M et al. · 2022Systematic reviewA systematic review of randomized controlled trials related to the effects of garlic supplementation on platelet aggregationView study →}.

A Marker of Oil-Macerated Garlic

Ajoene’s occurrence is unusually well-defined for a plant constituent, because it is a processing artefact with a chemistry that can be steered.

Lawson and colleagues quantified the sulfur compounds of commercial garlic products by HPLC and found a clean separation by preparation type: thiosulfinates (allicin) were released only from garlic cloves and garlic powder; the diallyl, methyl allyl and dimethyl sulfide series were the exclusive constituents of steam-distilled garlic oil; and the vinyldithiins and ajoenes were found only in products containing garlic macerated in vegetable oil ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}. Garlic powder suspended in gel, and garlic aged in aqueous alcohol, contained none of these non-ionic sulfur compounds at all ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.

A later extraction study reached the same conclusion from the other direction: comparing hydroalcoholic solvents with sunflower oil across high-pressure extraction and maceration, sunflower oil specifically fostered allicin decay to ajoenes, vinyldithiins and sulfides, while the aqueous routes preserved the hydrophilic compounds ^{4Reference 4Ferioli F et al. · 2020Comparison of two extraction methods (high pressure extraction vs. maceration) for the total and relative amount of hydrophilic and lipophilic organosulfur compounds in garlic cloves and stemsView study →}.

The practical reading: a garlic capsule labelled “aged garlic extract” is standardised to S-allylcysteine and contains essentially no ajoene; a steam-distilled garlic oil contains diallyl disulfide and diallyl trisulfide but not ajoene; an oil-macerated garlic preparation is the one that carries it ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.

The E & Z Isomers

Ajoene has a vinyl double bond and is almost always isolated as a mixture of E- and Z- geometric isomers, which is why the compound is conventionally written (E,Z)-ajoene ^{1,27Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →Reference 27Li M et al. · 2002In vitroAntitumor activity of Z-ajoene, a natural compound purified from garlic: antimitotic and microtubule-interaction properties — in vitro and miceView study →}. Most of the classical antiplatelet literature tested the mixture, and the papers rarely state the isomer ratio.

Where the isomers have been separated, they are not identical:

• Z-ajoene is moderately more active than E-ajoene at inhibiting tumour-cell growth in vitro, a difference read as evidence that specific protein interactions rather than bulk reactivity drive the effect ^{31Reference 31Kaschula CH et al. · 2010ReviewGarlic-derived anticancer agents: structure and biological activity of ajoene — reviewView study →}. The dedicated antitumour characterisation — G2/M arrest and microtubule disassembly — was done on the purified cis-Z isomer ^{27Reference 27Li M et al. · 2002In vitroAntitumor activity of Z-ajoene, a natural compound purified from garlic: antimitotic and microtubule-interaction properties — in vitro and miceView study →}.
• In a gerbil forebrain-ischaemia model both isomers were neuroprotective at 25 mg/kg orally, but the effect was more prominent with Z-ajoene, which also lowered hippocampal lipid peroxidation ^{36Reference 36Yoo DY et al. · 2014AnimalNeuroprotective effects of Z-ajoene, an organosulfur compound derived from oil-macerated garlic, in the gerbil hippocampal CA1 region after transient forebrain ischemia — animal modelView study →}.
• In a Caco-2 intestinal-monolayer model, neither isomer crossed the cell layer in either direction, and both were metabolised by the cells ^{38Reference 38Tian L et al. · 2007In vitroCharacteristics of uptake, transport and efflux of Z- and E-ajoenes in Caco-2 cell monolayers in vitroView study →}.

So: where a study names an isomer it is usually Z, and Z tends to be the more active one; where a study does not name one, assume the E/Z mixture.

The Crush-Then-Heat Finding

One of the few genuinely actionable kitchen findings in garlic pharmacology comes from a study of cooking and antiplatelet activity — and it is worth stating precisely, because it is widely mangled.

Cavagnaro and colleagues heated garlic as crushed versus uncrushed cloves by several methods and measured the in-vitro antiaggregatory activity of the resulting extracts on human platelets, alongside allicin and pyruvate as chemical predictors ^{13Reference 13Cavagnaro PF et al. · 2007In vitroEffect of cooking on garlic (Allium sativum L.) antiplatelet activity and thiosulfinates content — in vitroView study →}. What they found:

• Oven-heating at 200 °C, or immersion in boiling water, for 3 minutes or less did not reduce antiplatelet activity relative to raw garlic.
• At 6 minutes, activity was completely suppressed in uncrushed cloves but only partially reduced — still significant — in cloves that had been crushed before heating.
• Beyond ~10 minutes at those temperatures, activity was abolished either way.
• Microwaved garlic had no antiplatelet effect at all; adding raw garlic juice back to microwaved uncrushed garlic restored full activity.
• Activity tracked allicin and pyruvate levels throughout, which is the authors’ basis for attributing the response to allicin and the thiosulfinates.

The mechanistic explanation is enzymatic. Alliinase — the enzyme that converts alliin to allicin — is heat-labile. Crushing a clove lets the enzyme run before heat destroys it, so the thiosulfinate pool (and everything downstream of it, ajoene included) is already formed. Heating an intact clove denatures alliinase first, and nothing downstream ever forms.

The caveat to keep honest: the Cavagnaro study measured garlic extract activity and attributed it to allicin and thiosulfinates — it did not quantify ajoene ^{13Reference 13Cavagnaro PF et al. · 2007In vitroEffect of cooking on garlic (Allium sativum L.) antiplatelet activity and thiosulfinates content — in vitroView study →}. Ajoene inherits the finding as an allicin-derived product, not as a separately measured one. And “crush, then wait ~10 minutes, then cook briefly” is a reasonable inference from this data, not a tested protocol.

What It's Used For

Ajoene has an unusual evidence shape. It is one of the most-studied single molecules in garlic, with a defined molecular target for its lead activity — and yet almost none of that work is in humans. The exception is a small run of topical antifungal trials from a single Venezuelan group, which remain the closest thing to isolate-level clinical evidence for any garlic compound.

Evidence by IndicationStrength of support · Beta

Support is an experimental score — weighted by study type (human > animal > in vitro) and volume. A beta, not a validated metric. Note the split: the antiplatelet row scores high on mechanistic depth and animal in-vivo work with no human trials, while the antifungal row scores on small human trials from a single group. Read the per-row basis.

01Antiplatelet / antithromboticPromising56%Defined GPIIb/IIIa target + human ex-vivo platelets + dog, pig and baboon in vivo; no human trial ^{5,6,10,11Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →Reference 10Apitz-Castro R et al. · 1994AnimalA garlic derivative, ajoene, inhibits platelet deposition on severely damaged vessel wall in an in vivo porcine experimental model — animal modelView study →Reference 11Teranishi K et al. · 2003In vitroInhibition of baboon platelet aggregation in vitro and in vivo by the garlic derivative, ajoene — animal modelView study →}

02Topical antifungal (dermatophytosis)Promising48%Three small human trials vs. terbinafine, one group, unreplicated ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}

03Antibacterial & antibiofilmShaky34%Broad in-vitro MICs + quorum-sensing target + one mouse lung-infection model ^{21,22Reference 21Naganawa R et al. · 1996In vitroInhibition of microbial growth by ajoene, a sulfur-containing compound derived from garlic — in vitroView study →Reference 22Jakobsen TH et al. · 2012In vitroAjoene, a sulfur-rich molecule from garlic, inhibits genes controlled by quorum sensing — in vitro and mouse modelView study →}

04AnticancerShaky30%Cell lines with an identified covalent target (vimentin) + mouse melanoma models ^{27,30,33Reference 27Li M et al. · 2002In vitroAntitumor activity of Z-ajoene, a natural compound purified from garlic: antimitotic and microtubule-interaction properties — in vitro and miceView study →Reference 30Taylor P et al. · 2006AnimalAjoene inhibits both primary tumor growth and metastasis of B16/BL6 melanoma cells in C57BL/6 mice — animal modelView study →Reference 33Kaschula CH et al. · 2019In vitroThe garlic compound ajoene covalently binds vimentin, disrupts the vimentin network and exerts anti-metastatic activity in cancer cells — in vitroView study →}

05AntiparasiticShaky22%In-vitro T. cruzi and Leishmania with a phospholipid-biosynthesis mechanism ^{25,26Reference 25Urbina JA et al. · 1993In vitroInhibition of phosphatidylcholine biosynthesis and cell proliferation in Trypanosoma cruzi by ajoene, an antiplatelet compound isolated from garlic — in vitroView study →Reference 26Ledezma E et al. · 2002In vitroAntiproliferative and leishmanicidal effect of ajoene on various Leishmania species: ultrastructural study — in vitroView study →}

06Neuroprotective / cerebrovascularShaky16%Two small rodent studies (gerbil ischaemia, stroke-prone rats) ^{36,37Reference 36Yoo DY et al. · 2014AnimalNeuroprotective effects of Z-ajoene, an organosulfur compound derived from oil-macerated garlic, in the gerbil hippocampal CA1 region after transient forebrain ischemia — animal modelView study →Reference 37Yamada N et al. · 2006AnimalProphylactic effects of ajoene on cerebral injury in stroke-prone spontaneously hypertensive rats (SHRSP) — animal modelView study →}

Mechanisms

The GPIIb/IIIa interaction is the one genuinely selective mechanism on this list. Most of the rest are downstream of a single chemical fact — ajoene’s disulfide reacts with accessible protein cysteines — which explains both the breadth of the in-vitro activity and why selectivity is the open question.

Pharmacokinetics

This is the weakest part of the file, and it undercuts most of the systemic claims above. There is no published human pharmacokinetic study of ajoene: no oral bioavailability figure, no plasma concentration-time curve, no half-life, no identified human metabolites.

What exists is discouraging for oral use. In cultured Caco-2 intestinal monolayers, Z- and E-ajoene were detectable only on the apical side and could not be transported in either direction across the monolayer; both were metabolised by the cells, and that metabolism was partially blocked by ascorbate, by the CYP3A inhibitor metyrapone, and by sodium azide — implicating cytochrome-P450-mediated intestinal metabolism ^{38Reference 38Tian L et al. · 2007In vitroCharacteristics of uptake, transport and efflux of Z- and E-ajoenes in Caco-2 cell monolayers in vitroView study →}. Taken at face value, that predicts poor systemic exposure from an oral dose.

Set against this: ajoene is stable in water and in oil, unlike allicin ^{18Reference 18Ledezma E · 2006ReviewAjoene the main active compound of garlic (Allium sativum): a new antifungal agent — reviewView study →}, and oral dosing in rodents does produce measurable effects on brain injury and on stroke mortality at 0.5–25 mg/kg ^{36,37Reference 36Yoo DY et al. · 2014AnimalNeuroprotective effects of Z-ajoene, an organosulfur compound derived from oil-macerated garlic, in the gerbil hippocampal CA1 region after transient forebrain ischemia — animal modelView study →Reference 37Yamada N et al. · 2006AnimalProphylactic effects of ajoene on cerebral injury in stroke-prone spontaneously hypertensive rats (SHRSP) — animal modelView study →}, so some systemic exposure evidently occurs in animals. Its lipophilicity and reactivity are the likely constraints — a molecule whose mechanism is covalent cysteine modification will be scavenged by glutathione and plasma thiols long before it reaches a distant target. Broad reviews of Allium sulfur-compound bioavailability treat ajoene’s disposition as an open question rather than a settled one ^{44Reference 44Subramanian MS et al. · 2020ReviewPrevailing knowledge on the bioavailability and biological activities of sulphur compounds from Alliums: a potential drug candidate — reviewView study →}.

Clinical Trials

The entire human record for ajoene is topical and dermatological: three small comparative trials of 0.4–1% ajoene cream or gel against 1% terbinafine in tinea pedis, cruris and corporis, all published between 1996 and 2000 by the same Venezuelan group ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}. There are no human trials of oral or systemic ajoene for any indication — including the antiplatelet effect it is best known for.

Last checked: July 2026.

Isolate vs. Plant Studies

Ajoene sits at an unusual point on this axis: almost all of its research is isolate research, which is normally a strength — but it is isolate research that has never been connected to a human outcome from garlic.

The antiplatelet work used purified or synthetic ajoene on washed human platelets and in animal models, not garlic extract ^{5,6,9,10,11Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →Reference 9Apitz-Castro R et al. · 1992Effect of ajoene, the major antiplatelet compound from garlic, on platelet thrombus formationView study →Reference 10Apitz-Castro R et al. · 1994AnimalA garlic derivative, ajoene, inhibits platelet deposition on severely damaged vessel wall in an in vivo porcine experimental model — animal modelView study →Reference 11Teranishi K et al. · 2003In vitroInhibition of baboon platelet aggregation in vitro and in vivo by the garlic derivative, ajoene — animal modelView study →}. The quorum-sensing study went further and confirmed the finding with synthetic ajoene after bioassay-guided fractionation of garlic extract ^{22Reference 22Jakobsen TH et al. · 2012In vitroAjoene, a sulfur-rich molecule from garlic, inhibits genes controlled by quorum sensing — in vitro and mouse modelView study →}. The anticancer target identification used synthetic fluorescent ajoene analogues ^{32,33Reference 32Kaschula CH et al. · 2016In vitroThe garlic compound ajoene targets protein folding in the endoplasmic reticulum of cancer cells — in vitroView study →Reference 33Kaschula CH et al. · 2019In vitroThe garlic compound ajoene covalently binds vimentin, disrupts the vimentin network and exerts anti-metastatic activity in cancer cells — in vitroView study →}. The antifungal trials applied isolated ajoene at stated percentages ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}.

The gap runs the other way. Every human trial of garlic — for blood pressure, cholesterol or platelet aggregation — used a whole preparation: garlic powder, aged garlic extract, garlic oil ^{43Reference 43Mollahosseini M et al. · 2022Systematic reviewA systematic review of randomized controlled trials related to the effects of garlic supplementation on platelet aggregationView study →}. Because ajoene is present only in oil-macerated products ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}, most of those trials used preparations that contained little or no ajoene at all. The molecule therefore cannot claim credit for garlic’s clinical record, and garlic’s clinical record cannot be used to validate the molecule.

One study bridges the two directly and is worth noting for its honesty: in stroke-prone rats, isolated ajoene and an oil-macerated garlic extract standardised to deliver the same 0.5 mg/day of ajoene produced the same protection ^{37Reference 37Yamada N et al. · 2006AnimalProphylactic effects of ajoene on cerebral injury in stroke-prone spontaneously hypertensive rats (SHRSP) — animal modelView study →} — consistent with ajoene being the active agent in that preparation, but equally consistent with co-occurring vinyldithiins and sulfides doing the work.

Prevalence in Nature

Ajoene is, in the strict sense, barely a natural product. It is not present in intact garlic and is not present in freshly crushed garlic in any meaningful quantity — it is a secondary transformation product that appears when allicin decomposes under the right conditions ^{1,3Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}.

Those conditions are specific. The HPLC survey of commercial garlic products found ajoenes only in preparations containing garlic macerated in vegetable oil; garlic cloves, garlic powder, steam-distilled garlic oil, garlic powder in gel and aged aqueous-alcohol garlic all lacked them ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}. Controlled extraction work confirms the mechanism: sunflower-oil maceration promotes allicin decay to ajoenes, vinyldithiins and sulfides, while hydroalcoholic extraction preserves the hydrophilic compounds instead ^{4Reference 4Ferioli F et al. · 2020Comparison of two extraction methods (high pressure extraction vs. maceration) for the total and relative amount of hydrophilic and lipophilic organosulfur compounds in garlic cloves and stemsView study →}. Heating crushed garlic is the other route by which the isomer mixture forms ^{31Reference 31Kaschula CH et al. · 2010ReviewGarlic-derived anticancer agents: structure and biological activity of ajoene — reviewView study →}.

Ajoene has not been credibly reported outside Allium sativum — unsurprising, since it requires the alliin/alliinase system to make allicin in the first place, and then a lipid environment for that allicin to rearrange in. Within the genus, other Allium species with different cysteine-sulfoxide profiles (onion’s isoalliin, for instance) generate different thiosulfinates and therefore different downstream products ^{45Reference 45Shang A et al. · 2019ReviewBioactive compounds and biological functions of garlic (Allium sativum L.) — reviewView study →}.

The same survey also flagged a practical problem: content varied four-fold between brands of oil-macerate and 33-fold between steam-distilled garlic oils, which the authors called out as a reason to analyse products before using them in clinical research ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}. A product labelled as an oil-macerated garlic preparation is not a reliable ajoene dose.

Discovery & Synthesis

The activity was found before the molecule. In 1983, Apitz-Castro and colleagues at the Venezuelan Institute for Scientific Research separated a methanol extract of garlic bulbs into three pure components and showed that one of them — “F3” — inhibited human platelet aggregation induced by every agonist tested, at roughly four times the potency of the others, and could even deaggregate already-aggregated platelets ^{2Reference 2Apitz-Castro R et al. · 1983In vitroEffects of garlic extract and of three pure components isolated from it on human platelet aggregation, arachidonate metabolism, release reaction and platelet ultrastructure — in vitroView study →}. The paper’s provisional structure for F3 was wrong.

The correct structure and the name came a year later. In 1984, Eric Block’s group, working with the Venezuelan team, established the compound as (E,Z)-4,5,9-trithiadodeca-1,6,11-triene 9-oxide and named it ajoene, from the Spanish ajo, garlic ^{1Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →}. The formation chemistry — three allicin molecules condensing to two of ajoene — was worked out as part of Block’s long series on alkyl thiosulfate esters ^{1Reference 1Block E et al. · 1984The chemistry of alkyl thiosulfate estersView study →}.

Total synthesis came late. Because ajoene had historically been made from allicin, and allicin is too unstable to be a reliable starting material, a practical route was a genuine bottleneck. A short total synthesis of ajoene from simple building blocks, suitable for scale-up, was published only in 2018 by Silva, Wirth and co-workers ^{39Reference 39Silva F et al. · 2018Short total synthesis of ajoeneView study →}, followed in 2020 by an improved batch-and-continuous-flow version ^{40Reference 40Raynbird MY et al. · 2020Short total synthesis of ajoene, (E,Z)-4,5,9-trithiadodeca-1,6,11-triene 9-oxide, in batch and (E,Z)-4,5,9-trithiadodeca-1,7,11-triene in continuous flowView study →}. Structure–activity work on synthetic analogues shows that substituting the terminal allyl groups can produce compounds more potent than ajoene itself in vitro ^{31Reference 31Kaschula CH et al. · 2010ReviewGarlic-derived anticancer agents: structure and biological activity of ajoene — reviewView study →}.

Manufacture today is a mix. Research-grade ajoene is chemically synthesised — it is available as a defined compound and was described as such in the antifungal trial literature ^{18Reference 18Ledezma E · 2006ReviewAjoene the main active compound of garlic (Allium sativum): a new antifungal agent — reviewView study →}. Commercially, “ajoene” reaching consumers does so almost entirely as an incidental constituent of oil-macerated garlic products rather than as an isolated ingredient, and no ajoene drug product is licensed anywhere.

Patents: not yet researched.

Toxicity & Safety

Ajoene carries a moderate flag. This is not because it is acutely poisonous — the topical human trials reported it as safe and effective across 160-odd treated patients ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}, and no isolate toxicity signal appears in the animal work at the doses used. It is because the molecule’s single best-established pharmacological action is potent, irreversible inhibition of platelet aggregation ^{5,6Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →}, which is a genuine interaction consideration wherever bleeding risk matters, and because there is no systemic human safety dataset at all to set against it.

Safety at a Glance

⚠️ Moderate toxicityBleeding riskDrug interactions

• Topical use looks well tolerated. 0.4–1% ajoene cream/gel applied twice daily for a week was reported safe in three dermatophyte trials, with cure rates comparable to 1% terbinafine ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}.
• Potent antiplatelet activity is the headline risk. Ajoene blocks fibrinogen binding to GPIIb/IIIa at sub-micromolar concentrations and inhibits aggregation irreversibly, so the effect persists for the life of the affected platelets ^{5,6Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →}.
• Anticoagulants and antiplatelet drugs. Additive bleeding risk is plausible with warfarin, direct oral anticoagulants, aspirin, clopidogrel and NSAIDs; ajoene also synergises with prostacyclin, indomethacin and dipyridamole in vitro ^{7Reference 7Apitz-Castro R et al. · 1986In vitroAjoene, the antiplatelet principle of garlic, synergistically potentiates the antiaggregatory action of prostacyclin, forskolin, indomethacin and dypiridamole on human platelets — in vitroView study →}. Garlic–warfarin and garlic–antiplatelet interactions are documented at the herb level ^{42Reference 42Borrelli F et al. · 2007ReviewGarlic (Allium sativum L.): adverse effects and drug interactions in humans — reviewView study →}.
• Stop garlic and garlic-oil products before surgery. The standard advice for garlic — discontinue ~7–10 days before elective surgery or a dental or invasive procedure — applies with more force to a stable, oil-soluble antiplatelet molecule ^{42Reference 42Borrelli F et al. · 2007ReviewGarlic (Allium sativum L.): adverse effects and drug interactions in humans — reviewView study →}.
• No oral human safety data exist. No human pharmacokinetics, no repeat-dose toxicology, no genotoxicity package for the isolate. Systemic use of isolated ajoene is uncharacterised territory.
• A reactive, covalently-binding molecule. Ajoene works by S-thiolating accessible protein cysteines — the same chemistry as its antimicrobial and anticancer effects — so target selectivity in a whole organism is an open question, not a demonstrated property ^{33,34Reference 33Kaschula CH et al. · 2019In vitroThe garlic compound ajoene covalently binds vimentin, disrupts the vimentin network and exerts anti-metastatic activity in cancer cells — in vitroView study →Reference 34Kusza DA et al. · 2022In vitroActivity-based proteomic identification of the S-thiolation targets of ajoene in MDA-MB-231 breast cancer cells — in vitroView study →}.

Full Safety & Interactions Detail

Bleeding and antiplatelet interaction. This is the interaction that matters. Ajoene inhibits platelet aggregation induced by ADP, collagen, arachidonate, adrenaline and calcium ionophore, and the inhibition is irreversible — treated platelets do not recover function on washing or resuspension in fresh plasma ^{2,6Reference 2Apitz-Castro R et al. · 1983In vitroEffects of garlic extract and of three pure components isolated from it on human platelet aggregation, arachidonate metabolism, release reaction and platelet ultrastructure — in vitroView study →Reference 6Srivastava KC · 1993In vitroEffects of a garlic-derived principle (ajoene) on aggregation and arachidonic acid metabolism in human blood platelets — in vitroView study →}. It acts directly at the fibrinogen receptor with an ID50 of ~0.8 µM for fibrinogen binding ^{5Reference 5Apitz-Castro R et al. · 1986In vitroThe molecular basis of the antiplatelet action of ajoene: direct interaction with the fibrinogen receptor — in vitroView study →}, and it potentiates other antiaggregatory agents rather than merely adding to them, including prostacyclin, forskolin, indomethacin and dipyridamole ^{7Reference 7Apitz-Castro R et al. · 1986In vitroAjoene, the antiplatelet principle of garlic, synergistically potentiates the antiaggregatory action of prostacyclin, forskolin, indomethacin and dypiridamole on human platelets — in vitroView study →}. In dogs on extracorporeal circulation and in baboons, in-vivo dosing produced measurable antiplatelet effects ^{7,11Reference 7Apitz-Castro R et al. · 1986In vitroAjoene, the antiplatelet principle of garlic, synergistically potentiates the antiaggregatory action of prostacyclin, forskolin, indomethacin and dypiridamole on human platelets — in vitroView study →Reference 11Teranishi K et al. · 2003In vitroInhibition of baboon platelet aggregation in vitro and in vivo by the garlic derivative, ajoene — animal modelView study →}. At the whole-herb level, garlic is a recognised interactant with warfarin and antiplatelet agents, with the class caution to withhold before surgery ^{42Reference 42Borrelli F et al. · 2007ReviewGarlic (Allium sativum L.): adverse effects and drug interactions in humans — reviewView study →}; a systematic review of RCTs confirms that garlic supplementation reduces ex-vivo platelet aggregation in humans, though variably by dose and preparation ^{43Reference 43Mollahosseini M et al. · 2022Systematic reviewA systematic review of randomized controlled trials related to the effects of garlic supplementation on platelet aggregationView study →}. Anyone on anticoagulant or antiplatelet therapy, with a bleeding disorder, or approaching surgery should treat oil-macerated garlic products as pharmacologically active rather than as food.

Reactivity and selectivity. Ajoene’s mechanism is covalent: its disulfide bond S-thiolates exposed cysteine residues, an action confirmed by the fact that cysteine abolishes its antimicrobial activity ^{21Reference 21Naganawa R et al. · 1996In vitroInhibition of microbial growth by ajoene, a sulfur-containing compound derived from garlic — in vitroView study →} and by direct proteomic identification of its protein targets in cancer cells ^{33,34Reference 33Kaschula CH et al. · 2019In vitroThe garlic compound ajoene covalently binds vimentin, disrupts the vimentin network and exerts anti-metastatic activity in cancer cells — in vitroView study →Reference 34Kusza DA et al. · 2022In vitroActivity-based proteomic identification of the S-thiolation targets of ajoene in MDA-MB-231 breast cancer cells — in vitroView study →}. Reactive electrophiles of this kind are inherently promiscuous. The molecule inhibits protein prenylation by covalently modifying a substrate cysteine ^{35Reference 35Ferri N et al. · 2003In vitroAjoene, a garlic compound, inhibits protein prenylation and arterial smooth muscle cell proliferation — in vitroView study →} and inhibits cytochrome-P450-mediated activation of benzo[a]pyrene in vitro ^{41Reference 41Ishikawa K et al. · 1996In vitroAntimutagenic effects of ajoene, an organosulfur compound derived from garlic — in vitroView study →} — the latter framed as a chemopreventive benefit, but equally a signal that ajoene interferes with drug-metabolising enzymes. Caco-2 work implicating CYP3A in intestinal ajoene metabolism ^{38Reference 38Tian L et al. · 2007In vitroCharacteristics of uptake, transport and efflux of Z- and E-ajoenes in Caco-2 cell monolayers in vitroView study →} raises, without answering, the question of CYP-mediated drug interactions.

What is not known. There is no repeat-dose oral toxicology, no genotoxicity or carcinogenicity package, and no human pharmacokinetic or safety study for isolated ajoene. Reproductive and developmental toxicity have not been characterised for the isolate; no dedicated dataset exists, and that absence is stated rather than inferring safety from it. Pregnancy and lactation decisions belong to the garlic monograph or the specific product, where actual intake is decided.

What is not known. The topical trials are the only human exposure data, they are small, they are 25+ years old, and they come from a single group ^{15,16,17Reference 15Ledezma E et al. · 1996Clinical trialEfficacy of ajoene, an organosulphur derived from garlic, in the short-term therapy of tinea pedis — clinical trial in patientsView study →Reference 16Ledezma E et al. · 1999RCTAjoene in the topical short-term treatment of tinea cruris and tinea corporis in humans — randomized comparative study with terbinafineView study →Reference 17Ledezma E et al. · 2000RCTEfficacy of ajoene in the treatment of tinea pedis: a double-blind and comparative study with terbinafine — randomized controlled trialView study →}. Absence of reported adverse effects in that setting is not evidence of systemic safety.

Dosage

There is no established human dose for oral ajoene. The only human dosing on record is topical, from the dermatophyte trials.

Typical Forms of Human Exposure

In practice, nobody takes ajoene. People take garlic, and whether they get any ajoene depends entirely on how the product was made: oil-macerated garlic preparations contain it, while fresh cloves, garlic powder, steam-distilled garlic oil and aged garlic extract effectively do not ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}. Even among oil-macerates, content varied four-fold between brands in the one published survey ^{3Reference 3Lawson LD et al. · 1991Identification and HPLC quantitation of the sulfides and dialk(en)yl thiosulfinates in commercial garlic productsView study →}, so no meaningful daily intake figure can be attached to a garlic product without an assay.

For culinary garlic, the actionable point is the cooking one rather than a dose: crushing cloves before heating, and keeping heating brief, preserves antiplatelet activity that is destroyed by prolonged cooking of intact cloves ^{13Reference 13Cavagnaro PF et al. · 2007In vitroEffect of cooking on garlic (Allium sativum L.) antiplatelet activity and thiosulfinates content — in vitroView study →}.

These are doses studied in research and are not a personal recommendation.

References

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