Securidaca longepedunculata
Violet tree / 'Mpesu' root bark (Polygalaceae)
Evidence grade 2 of 5, Thin. Read how the Atlas grades evidence.
The written rationale for this grade is still being prepared.
- FDA
- Not FDA evaluated; sold as unregulated botanical
Reference only. Not medical advice.
What can go wrong
Documented human fatalities from root-bark ingestion; reported toxic effects include vomiting, restlessness, convulsions, and death. There is no established safe oral dose for sexual use. The wintergreen constituent methyl salicylate is itself toxic in quantity. Self-dosing with this root cannot be considered safe.
This is something to take to a clinician. The Atlas can tell you what is known about securidaca longepedunculata in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.
Securidaca longepedunculata is one of the most widely used medicinal plants in sub-Saharan Africa, with the root bark applied for an enormous range of ailments including impotence and low libido (the Venda 'Mpesu' trade in southern Africa markets it specifically as a sexual tonic). The root contains methyl salicylate (giving it a wintergreen smell), saponins, the alkaloid securinine-type compounds, xanthones, and benzyl benzoate. Animal data are sparse but suggestive; the more important clinical fact is that this is a recognized poison in African toxicology, with root extracts implicated in fatal human poisonings. Evidence for aphrodisiac efficacy is ethnobotanical and preclinical, not clinical.
A revered sub-Saharan root with genuine pharmacology and a genuine toxic edge.
What people take it for
These are the reasons people give for taking it. They are not effects it has been shown to have.
How it is supposed to work
No validated erectogenic mechanism exists. Proposed contributors include saponins (a recurring theme across putative aphrodisiac plants, hypothesized to affect steroidogenesis), methyl salicylate as a counter-irritant and circulatory stimulant, and CNS-active securinega-type alkaloids. Securinine itself is a known GABA-A receptor antagonist and CNS stimulant/convulsant, which plausibly explains both perceived 'energizing' effects and the plant's documented toxicity.
Chemically heterogeneous: the volatile fraction is dominated by methyl salicylate and methyl benzoate; the non-volatile fraction includes triterpenoid saponins (securidacasaponins), xanthones, the dihydropyranocoumarins, and Securinega-type alkaloids.
The active principle is also the toxin
The same securinine-class alkaloids that may produce stimulation are convulsant GABA antagonists. There is no therapeutic window established for an aphrodisiac use, and the African toxicology literature treats root ingestion as potentially lethal rather than benign.
Safety in detail
- Implicated in fatal human poisonings in African toxicology reports
- Securinine-type alkaloids are convulsant GABA-A antagonists
- Methyl salicylate content adds salicylate toxicity risk
- No standardized commercial product; wild-harvested potency varies enormously
What people get wrong
Often saidA trusted traditional tonic must be safe
ActuallyThis is one of the more dangerous plants in this library; African poison-control literature documents lethal ingestions. Traditional use does not equal safety.
Who profits, and who pushes back
Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.
How we got here
Across the savanna belt from Senegal to South Africa, the violet tree is a near-universal medicinal plant, sometimes called the most important medicinal plant of a given region. Among the Venda and neighbouring peoples of South Africa, the root is the basis of the 'Mpesu' male-tonic trade, sold in markets and increasingly online as a virility booster, sometimes with extravagant marketing claims about penile enhancement.
The people taking it
Use is concentrated in sub-Saharan Africa, with diaspora and internet sales extending the Mpesu trade to the UK, US, and elsewhere. It is wild-harvested, and heavy root-bark collection raises conservation concern for a slow-growing tree.
What we do not know
- Is there any reproducible erectogenic effect distinct from CNS stimulation?
- Can a safe extract be separated from the convulsant alkaloid fraction?
The market for this
What follows describes how this is bought and sold. It is not a buying guide and it is not an endorsement of any seller.
Sold as raw root chips, powders, and 'Mpesu' capsules with no standardization. Adulteration and species substitution are likely given the unregulated market, and the genuine article carries real toxicity.
At a glance
- Family
- Polygalaceae
- Part used
- Root and root bark
- Smell marker
- Methyl salicylate (wintergreen)
- Trade name (southern Africa)
- Mpesu
- Toxicity
- Documented fatal human poisonings
What this entry does not yet cover
What follows is unfinished work on our side, not a finding about Securidaca longepedunculata. A short entry is not a safe entry.
- Timeline. We have not built the dated record of research and regulatory events.
- Cost and market. We have not documented what it sells for or who sells it.
- Supply chain. We have not mapped where it is made.
- Who uses it. We have not documented the user groups.
- What could change. No forward-looking summary yet.
- How it compares. We have not set it against the alternatives.
- Children and teenagers. We have not checked what is known about younger people.
Sources
The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.
The studies that matter
Ethnobotanical surveys (multiple, southern/west Africa)2000s-2010s
Repeatedly rank S. longepedunculata among the most-cited plants for impotence and as a general panacea
Rodent aphrodisiac screens of related saponin-rich rootsvarious
Show mounting-frequency changes but no S. longepedunculata-specific RCT exists