Spinosin

Pharmacology & Research

Spinosin is a flavone C-glycoside (2”-O-β-glucopyranosyl swertisin — a 6-C-glucosyl apigenin derivative) and one of the two official quality markers of sour jujube seed (Ziziphus jujuba var. spinosa, suan zao ren), the other being jujuboside A. Its distinctive place among the seed’s actives is chemical and mechanistic: where the triterpenoid saponins jujuboside A and jujuboside B and the cyclopeptide alkaloid sanjoinine A are GABAergic, spinosin is the serotonergic outlier — its sedative effect runs through post-synaptic 5-HT1A receptors. The load-bearing discipline is the usual one: the herb’s human insomnia use is the whole seed and Suanzaoren decoction, in which spinosin is a marker and one contributor, not a separately-trialled drug.

1. Sedative / hypnotic

Spinosin’s marquee signal and the clean chemical differentiator from the herb’s GABAergic saponins/alkaloid. Three convergent rodent studies show it potentiates pentobarbital-induced sleep (↑ duration, ↓ latency) via the serotonergic system, specifically post-synaptic 5-HT1A receptors ^{1,2Reference 1Wang LE et al. · 2008Spinosin, a C-glycoside flavonoid from Semen Zizyphi Spinosae, potentiated pentobarbital-induced sleep via the serotonergic systemView study →Reference 2Wang LE et al. · 2010The potentiating effect of spinosin on pentobarbital-induced sleep may be related to postsynaptic 5-HT1A receptorsView study →}, with a presynaptic 5-HT1A contribution to the loss-of-righting-reflex augmentation ^{3Reference 3Liu J et al. · 2012AnimalAugmentative effect of spinosin on pentobarbital-induced loss of righting reflex in mice associated with presynaptic 5-HT1A receptorsView study →}; a 2025 EEG/EMG study found spinosin raises NREM/slow-wave sleep and shifts c-Fos in sleep-wake nuclei ^{5Reference 5Wang Y et al. · 2025AnimalSpinosin enhances non-rapid-eye-movement sleep and alters c-Fos expression in sleep-wake regulatory brain regions in miceView study →}.

Gap: all rodent, and mostly hypnotic potentiation (co-administered barbiturate) rather than standalone sleep induction; human insomnia efficacy belongs to the whole seed / Suanzaoren decoction, in which spinosin is one of two markers, not a validated standalone hypnotic ^{1,3Reference 1Wang LE et al. · 2008Spinosin, a C-glycoside flavonoid from Semen Zizyphi Spinosae, potentiated pentobarbital-induced sleep via the serotonergic systemView study →Reference 3Liu J et al. · 2012AnimalAugmentative effect of spinosin on pentobarbital-induced loss of righting reflex in mice associated with presynaptic 5-HT1A receptorsView study →}.

2. Cognition / anti-amnesic

A genuine second signal, distinct from the sedative saponins. Spinosin reversed scopolamine-induced memory impairment in mice (cholinergic/anti-amnesic) ^{6Reference 6Ko SY et al. · 2014AnimalAmeliorating effect of spinosin, a C-glycoside flavonoid, on scopolamine-induced memory impairment in miceView study →} and improved learning/memory with anti-amyloid and neuroprotective effects in an Alzheimer’s-model mouse ^{7Reference 7He B et al. · 2019AnimalNeuroprotective effects of spinosin on the recovery of learning and memory in a mouse model of Alzheimer’s diseaseView study →}.

Gap: two separate models with no independent replication of the AD-model result, no human cognition data, and no established translation to oral dosing ^{6,7Reference 6Ko SY et al. · 2014AnimalAmeliorating effect of spinosin, a C-glycoside flavonoid, on scopolamine-induced memory impairment in miceView study →Reference 7He B et al. · 2019AnimalNeuroprotective effects of spinosin on the recovery of learning and memory in a mouse model of Alzheimer’s diseaseView study →}.

3. Anxiolytic

Spinosin produced anxiolytic-like behaviour in mice, with both GABA-A and 5-HT (5-HT1A) systems implicated — consistent with the serotonergic sedative story ^{4Reference 4Liu J et al. · 2015AnimalGABA and 5-HT systems are implicated in the anxiolytic-like effect of spinosin in miceView study →}.

Gap: a single behavioural study with a hedged dual mechanism and no dose-response translation or human data ^{4Reference 4Liu J et al. · 2015AnimalGABA and 5-HT systems are implicated in the anxiolytic-like effect of spinosin in miceView study →}.

Mechanisms

Target / pathway	Effect	Relevant to
Post-synaptic 5-HT1A receptors (serotonergic)	agonist-like potentiation → prolonged pentobarbital sleep (the replicated, distinctive mechanism)	sedative / hypnotic (differentiator from the GABAergic saponins)
Presynaptic 5-HT1A receptor	involved in augmentation of pentobarbital loss-of-righting-reflex	sedative / hypnotic
GABA-A / GABAergic transmission	co-implicated (with 5-HT) in anxiolytic-like behaviour	anxiolytic
NREM / slow-wave sleep; c-Fos in sleep-wake nuclei	↑ NREM/SWS; altered c-Fos in sleep-regulatory regions (EEG/EMG)	sleep architecture
Cholinergic signalling (scopolamine reversal)	anti-amnesic; restores scopolamine-impaired memory	cognition
Amyloid-β / neuroprotection (AD model)	↓ Aβ burden, improved learning/memory	cognition / neuroprotective

The 5-HT1A serotonergic route is the load-bearing, replicated finding and the clean distinction from jujuboside A/B and sanjoinine A (all GABAergic). A single study also reports cardioprotection against ischaemia-reperfusion ^{8Reference 8Gu M et al. · 2019AnimalSpinosin and 6‴-feruloylspinosin protect the heart against acute myocardial ischaemia and reperfusion in ratsView study →}, off the neuro-axis and not promoted here.

Pharmacokinetics

Spinosin is a flavone C-glycoside: the sugar is attached by a C–C bond, so — unlike O-glycosides — it resists acid/enzymatic hydrolysis and is not readily cleaved to an aglycone in the gut. Despite that stability, oral bioavailability is low, and this is the principal translational limit for the isolate ^{9Reference 9Kuang G et al. · 2022ReviewThe pharmacology, pharmacokinetics and toxicity of spinosin: a mini reviewView study →}. Central exposure is the mechanistically relevant question (the activity is central), and rodent work reports central effects after systemic dosing, but robust human ADME — Cmax, half-life, absolute oral bioavailability, BBB quantification — is not established. Net: a metabolically stable but poorly-absorbed C-glycoside whose rodent CNS activity outruns its documented oral pharmacokinetics.

Clinical trials

There are no human trials of isolated spinosin. Human insomnia/anxiety evidence belongs to the whole seed (suan zao ren) and the multi-herb Suanzaoren decoction, within which spinosin is one of the two official quality-control markers (with jujuboside A) — not a separately-trialled drug ^{9,10,11Reference 9Kuang G et al. · 2022ReviewThe pharmacology, pharmacokinetics and toxicity of spinosin: a mini reviewView study →Reference 10Shergis JL et al. · 2020ReviewBotanical, traditional, phytochemical, pharmacological, pharmacokinetic and toxicological characteristics of Ziziphi Spinosae Semen: a reviewView study →Reference 11Liu Y et al. · 2024ReviewPhytochemical, pharmacological, pharmacokinetic and toxicological characteristics of Ziziphi Spinosae Semen: a reviewView study →}.

Last checked: July 2026.

Toxicity & Safety

Spinosin carries a low flag. It is a natural flavone C-glycoside of a food-and-medicine seed (suan zao ren) with a long dietary/decoction history, and rodent efficacy studies report no acute toxicity signal at the doses used; the dedicated mini-review characterises its toxicity profile as low ^{9Reference 9Kuang G et al. · 2022ReviewThe pharmacology, pharmacokinetics and toxicity of spinosin: a mini reviewView study →}. The caveats: there is no comprehensive isolate toxicology (no definitive LD50, genotoxicity or repeat-dose organ-toxicity package for the pure compound), and — as a centrally-active sedative — it implies additive CNS depression with alcohol, benzodiazepines, barbiturates, Z-drugs and other sedatives. Poor oral bioavailability further limits real-world isolate exposure.

Pregnancy & lactation

Avoid (isolate). A centrally-acting serotonergic/GABAergic sedative with no reproductive-safety data, from a seed traditionally cautioned in pregnancy — there is no basis to consider the isolated compound safe. Whole-seed dietary/decoction exposure is a separate question outside this compound page.

Dosage

There is no established or recommended human dose for isolated spinosin. Cited figures in the literature are preclinical rodent research doses only (low mg/kg i.p./oral in the pentobarbital-sleep and cognition studies), not recommendations. Human exposure occurs via the whole seed — traditionally 9–18 g of dry-fried suan zao ren in decoction — within which spinosin occurs at roughly 0.34–1.84 mg/g of dried seed (an official marker; content varies with germplasm, harvest timing and dry-frying/roasting) alongside the co-marker jujuboside A.

References