Suma

This is the deepest part of suma’s literature, developed largely by one São Paulo group. Powdered root reduced ascitic-fluid accumulation and tumour-cell counts in Ehrlich-tumour mice at 200 mg/kg ^{1Reference 1Matsuzaki et al. · 2003Effect of Pfaffia paniculata (Brazilian ginseng) on the Ehrlich tumor in its ascitic form — animal studyView study →}, and in a two-stage mouse hepatocarcinogenesis model dietary root (0.5–10%) cut the number and size of preneoplastic liver lesions ^{2Reference 2da Silva et al. · 2005AnimalInhibitory effects of Pfaffia paniculata on preneoplastic and neoplastic lesions in a mouse hepatocarcinogenesis model — animal studyView study →}. Follow-up work showed the herb reduces cell proliferation and raises apoptosis in that liver model, and separately reduces corneal angiogenesis (new-vessel growth) in mice at 250–1000 mg/kg — a plausible route to slowing tumour vascularisation ^{4,5Reference 4Carneiro et al. · 2007AnimalPfaffia paniculata methanolic extract reduces angiogenesis in mice — animal studyView study →Reference 5da Silva et al. · 2010AnimalPfaffia paniculata roots decrease proliferation and increase apoptosis but do not affect cell communication in murine hepatocarcinogenesis — animal studyView study →}. The active material tracks to the saponins: the butanolic residue extends survival in tumour-bearing mice ^{3Reference 3Matsuzaki et al. · 2006Antineoplastic effects of butanolic residue of Pfaffia paniculata — animal studyView study →}, and in vitro the purified pfaffosidic fraction arrests the cell cycle and triggers caspase-3 apoptosis in HepG2 liver-cancer cells ^{7Reference 7da Silva et al. · 2015In vitroPfaffosidic fraction from Hebanthe paniculata induces cell cycle arrest and caspase-3-induced apoptosis in HepG2 cells — in vitro studyView study →}, while butanolic and methanolic extracts are cytotoxic to MCF-7 breast and HCT116 colon / 4T1 breast lines ^{6,9Reference 6Nagamine et al. · 2009In vitroCytotoxic effects of butanolic extract from Pfaffia paniculata on the human breast cancer cell line MCF-7 — in vitro studyView study →Reference 9Rahamouz-Haghighi et al. · 2024In vitroAntiproliferative assay of suma (Hebanthe eriantha) methanolic extract on HCT116 and 4T1 cancer cell lines, in vitro toxicity, and antibacterial activity — in vitro studyView study →}. Oral root also suppressed spontaneous thymic lymphoma in AKR/J mice, an effect the authors attributed to non-specific immune enhancement rather than direct cytotoxicity ^{8Reference 8Watanabe et al. · 2000AnimalEffects of oral administration of Pfaffia paniculata on incidence of spontaneous leukemia in AKR/J mice — animal studyView study →}.

Gap: every result is in a cell line or mouse; there is no human oncology data, and the isolated-saponin doses that work in vitro correspond to impractically large amounts of raw root.

The strongest non-cancer signal. In rats with TNBS-induced colitis (a model of inflammatory bowel disease), a P. paniculata extract at 200 mg/kg reduced macroscopic damage and lesion extent, lowered myeloperoxidase (a neutrophil marker), and preserved glutathione ^{10Reference 10Costa et al. · 2015Anti-inflammatory effects of Brazilian ginseng (Pfaffia paniculata) on TNBS-induced intestinal inflammation — animal studyView study →}. A follow-up traced the effect to signalling: 200 mg/kg suppressed colonic MPO and modulated MAPK and mucin (Muc) gene expression, consistent with a repair-and-dampen action on the gut mucosa ^{11Reference 11Costa et al. · 2018Pfaffia paniculata extract modulates Mapk and mucin pathways in intestinal inflammation — animal studyView study →}. Mechanistically this fits an earlier finding that the methanolic extract raises macrophage spreading and activity ^{12Reference 12Pinello et al. · 2006Effects of Pfaffia paniculata extract on macrophage activity — animal studyView study →}, and the anti-inflammatory reputation is echoed in the sibling species P. glomerata and P. townsendii ^{25Reference 25Corrêa et al. · 2018In vitroAnti-inflammatory and antioxidant properties of the extract, tiliroside and patuletin 3-O-β-D-glucopyranoside from Pfaffia townsendii — animal/in vitro studyView study →}.

Gap: the colitis work is rat-only and single-lab; no human inflammatory-disease trial exists, and the effective dose was reported per body-weight in rodents, not as a human whole-herb equivalent.

Suma’s most distinctive and most human-adjacent use. Working with red cells in the test tube, Ballas showed the extract acts as a sodium ionophore on sickle erythrocytes, raising their sodium and volume and improving hydration and deformability ^{13Reference 13Ballas · 2000In vitroHydration of sickle erythrocytes using a herbal extract (Pfaffia paniculata) in vitro — in vitro studyView study →}. Fifteen years later a second group confirmed the core finding on blood drawn from sickle-cell patients: extract at 0.5 mg/mL improved red-cell deformability at high shear stress (the condition found in capillaries), though it did not reduce cell fragility ^{14Reference 14Mozar et al. · 2015In vitroPfaffia paniculata extract improves red blood cell deformability in sickle cell patients — in vitro studyView study →}. Both are in vitro. The 2020 Cochrane review of phytomedicines for sickle-cell disease catalogued suma among candidate plants but concluded the controlled-trial evidence for any phytomedicine remains insufficient to judge benefit or harm ^{15Reference 15Oniyangi et al. · 2020Meta-analysisPhytomedicines for sickle cell disease — systematic review and meta-analysisView study →}.

Gap: the effect has never been tested in a living patient — no oral bioavailability, dosing, or clinical-endpoint data — and the historical “1000 mg three times daily” figure comes from a patent, not a peer-reviewed trial.

A consistent but entirely in vitro body of work, mostly from dental/endodontic groups. P. paniculata extracts reduced mixed-species biofilms of Candida albicans with Streptococcus mutans, Staphylococcus aureus, Enterococcus faecalis or Pseudomonas aeruginosa ^{17Reference 17Domingues et al. · 2023In vitroAntimicrobial action of four herbal plants over mixed-species biofilms of Candida albicans — in vitro studyView study →}, cut Klebsiella pneumoniae planktonic growth and biofilm ^{18Reference 18Paula-Ramos et al. · 2016In vitroKlebsiella pneumoniae planktonic and biofilm reduction by different plant extracts — in vitro studyView study →}, and inhibited Candida, P. aeruginosa and S. mutans biofilms with defined MICs while remaining tolerable to gingival fibroblasts ^{16Reference 16Miranda et al. · 2024In vitroPfaffia paniculata extract, a potential antimicrobial agent against Candida spp., Pseudomonas aeruginosa and Streptococcus mutans biofilms — in vitro studyView study →}. More recent work reports activity against the periodontal/Alzheimer-linked pathogens Porphyromonas gingivalis and P. endodontalis ^{19Reference 19Miranda et al. · 2025In vitroJuglans regia and Pfaffia paniculata extracts: implications for periodontal disease treatment and correlation with Alzheimer’s risk — in vitro studyView study →} and against the colorectal-cancer-associated oral anaerobes Fusobacterium nucleatum and Parvimonas micra ^{20Reference 20Miranda et al. · 2025In vitroAntioxidant, antimicrobial and anti-inflammatory effects of Juglans regia and Pfaffia paniculata extracts for colorectal cancer risk associated with oral pathogens — in vitro studyView study →}. Methanolic root extract also inhibited S. aureus and Proteus vulgaris in a whole-herb cytotoxicity screen ^{9Reference 9Rahamouz-Haghighi et al. · 2024In vitroAntiproliferative assay of suma (Hebanthe eriantha) methanolic extract on HCT116 and 4T1 cancer cell lines, in vitro toxicity, and antibacterial activity — in vitro studyView study →}.

Gap: all data are in vitro, frequently using glycolic or high-concentration dental-irrigant preparations that don’t map onto oral dosing; no in vivo infection model or clinical use is established.

Suma’s traditional use as a sexual and hormonal tonic has modest animal backing. Fluid extract improved copulatory performance in sexually sluggish/impotent male rats without affecting already-potent animals or locomotion ^{22Reference 22Arletti et al. · 1999AnimalStimulating property of Turnera diffusa and Pfaffia paniculata extracts on the sexual behavior of male rats — animal studyView study →}. Feeding powdered root to mice for 30 days raised plasma estradiol and progesterone in females and testosterone in males, with no adverse effects over the period ^{21Reference 21Oshima et al. · 2003AnimalPfaffia paniculata-induced changes in plasma estradiol-17β, progesterone and testosterone levels in mice — animal studyView study →}; a review of virility plants places suma in this group and ties the effect to its phytosteroids ^{23Reference 23Chauhan et al. · 2014ReviewA review on plants used for improvement of sexual performance and virility — reviewView study →}. The proposed driver is the phytoecdysteroids (chiefly 20-hydroxyecdysone/β-ecdysterone), which behave like weak anabolic/hormone-modulating agents but are not thought to bind mammalian steroid receptors directly and are rapidly metabolised ^{24Reference 24Lafont et al. · 2003ReviewPractical uses for ecdysteroids in mammals including humans: an update — reviewView study →}.

Gap: no human data; the hormone changes are animal-only, the mechanism is unresolved, and ecdysteroid pharmacokinetics in humans are poorly characterised.

Antioxidant activity is real in assay terms but weakly tied to P. paniculata specifically. Most of the quantified radical-scavenging data comes from the sibling species: P. townsendii ethanolic extract and its flavonoids tiliroside and patuletin glucoside showed DPPH/ORAC activity and reduced paw oedema ^{25Reference 25Corrêa et al. · 2018In vitroAnti-inflammatory and antioxidant properties of the extract, tiliroside and patuletin 3-O-β-D-glucopyranoside from Pfaffia townsendii — animal/in vitro studyView study →}, and P. glomerata extracts show anticholinesterase and antioxidant activity ^{26Reference 26Franco et al. · 2021AnimalA 20-hydroxyecdysone-enriched fraction from Pfaffia glomerata roots alleviates stress, anxiety and depression in mice — animal studyView study →}. For P. paniculata itself, antioxidant capacity is reported mainly as a supporting readout inside the colitis and antimicrobial studies (e.g. preserved glutathione) rather than as a primary result ^{10Reference 10Costa et al. · 2015Anti-inflammatory effects of Brazilian ginseng (Pfaffia paniculata) on TNBS-induced intestinal inflammation — animal studyView study →}.

Gap: the cleanest antioxidant data are on other Pfaffia species; for this herb the effect is inferred from its phenolic/ecdysteroid content and from secondary endpoints, not measured as a standalone outcome.

“Adaptogen” is suma’s headline traditional identity, but the experimental anti-stress evidence is thin for P. paniculata and stronger for its sibling. An ethnopharmacological survey of Brazilian herbals classed suma among the country’s tonic plants and argued for adaptogen status largely on traditional-use grounds ^{27Reference 27Mendes et al. · 2007ReviewBrazilian plants as possible adaptogens: an ethnopharmacological survey of books edited in Brazil — reviewView study →}. The concrete behavioural data belong to P. glomerata: a 20-hydroxyecdysone-enriched fraction reduced stress, anxiety and depression-like behaviour in mice and boosted brain antioxidant enzymes at 30 mg/kg ^{26Reference 26Franco et al. · 2021AnimalA 20-hydroxyecdysone-enriched fraction from Pfaffia glomerata roots alleviates stress, anxiety and depression in mice — animal studyView study →}. Because both plants are sold as “Brazilian ginseng” and share the ecdysteroid chemistry, the finding is suggestive for suma — but it was not obtained with this species ^{32Reference 32Cotrim Ribeiro et al. · 2024ReviewA comprehensive review of Pfaffia glomerata botany, ethnopharmacology, phytochemistry, biological activities and biotechnology — reviewView study →}.

Gap: no controlled stress/fatigue study used P. paniculata itself; the adaptogen label rests on tradition, ecdysteroid content, and read-across from P. glomerata.

The weakest of the scored indications. Suma appears on lists of Brazilian “hypoglycemiant” plants, and one analytical study characterised its trace-element profile alongside other antidiabetic herbs — but measured elements, not glucose-lowering activity ^{28Reference 28Zucchi et al. · 2005In vitroCharacterization of hypoglycemiant plants by total reflection X-ray fluorescence spectrometry — in vitro/analytical studyView study →}. Any blood-sugar rationale is constituent-level: the phytosterols and ecdysteroids have antidiabetic effects in other contexts, and pfaffic-acid/saponin chemistry is shared with hypoglycaemic plants. No efficacy study — animal or human — tests suma against a diabetes endpoint.

Gap: there is no direct evidence the herb lowers blood glucose; the claim is inherited from traditional lists and inferred from its sterol content.

Suma has low acute toxicity: repeat-dose gavage of powdered root or methanolic extract up to 1000 mg/kg produced no weight loss, liver/kidney histopathology or serum-enzyme changes in mice ^{4,12Reference 4Carneiro et al. · 2007AnimalPfaffia paniculata methanolic extract reduces angiogenesis in mice — animal studyView study →Reference 12Pinello et al. · 2006Effects of Pfaffia paniculata extract on macrophage activity — animal studyView study →}, and 30-day oral intake caused no adverse effects ^{21Reference 21Oshima et al. · 2003AnimalPfaffia paniculata-induced changes in plasma estradiol-17β, progesterone and testosterone levels in mice — animal studyView study →}. The clearest documented human risk is respiratory — inhaled root powder causes IgE-mediated occupational asthma and skin-test reactivity in exposed workers, so people handling the raw powder or with plant-dust allergy should take care ^{31Reference 31Subiza et al. · 1991Case reportOccupational asthma caused by Brazil ginseng dust — case reportView study →}. Because the root is rich in saponins (reported up to ~11%), large oral doses can cause gastrointestinal upset. Two signals warrant caution flags rather than firm conclusions: the isolated ecdysteroid β-ecdysone was genotoxic in rodent bone-marrow micronucleus and Allium cepa assays at human-therapeutic-equivalent concentrations ^{35Reference 35Neves et al. · 2016In vitroThe phytoecdysteroid β-ecdysone is genotoxic in rodent bone marrow micronuclei and Allium cepa L. assays — in vivo/in vitro studyView study →}, and one ginseng-interference study found that, unlike Asian/Indian/Siberian ginsengs, Brazilian ginseng did not interfere with serum digoxin immunoassays — a point in its favour rather than a hazard ^{34Reference 34Dasgupta et al. · 2005Effect of Brazilian, Indian, Siberian, Asian and North American ginseng on serum digoxin measurement by immunoassays — comparative studyView study →}. No human drug-interaction or long-term-safety studies of the whole herb exist.

Interactions have not been assessed — no human or animal drug-interaction study of suma exists, and the only interaction-adjacent datapoint is the digoxin-immunoassay panel above ^{34Reference 34Dasgupta et al. · 2005Effect of Brazilian, Indian, Siberian, Asian and North American ginseng on serum digoxin measurement by immunoassays — comparative studyView study →}. Treat the absence of interaction reports as untested, not as evidence of safety.