Educational information, not medical advice — ask your doctor or midwife.
Muira puama is a small tree from the Amazon rainforest of Brazil. Herbalists use the dried wood and root, cut into chips or ground to powder. The trade name "potency wood" comes from its old use for sexual complaints.
People buy it today for low sex drive, erection trouble, tiredness and low mood. In Latin American folk practice it was also treated as a tonic for the nerves. It is sold on its own and in blends with herbs like catuaba and guarana.
Here is the honest verdict. Human evidence is very thin, and the few studies in people had no comparison group. Most of the rest comes from lab dishes and from rats.
A long record of traditional use does not prove that a remedy works. It does not prove that it is safe either. Both have to be shown separately, and for this plant neither has been.
No one has shown how muira puama works in the human body. The ideas below come from lab and animal studies only.
In test tube work, extracts slow an enzyme called acetylcholinesterase (it breaks down a brain signalling chemical). Some memory drugs act on that same enzyme. Whether the herb does this in a living human brain is unknown.
In aged rats, extracts cut signs of oxidative stress (a kind of cell damage) in brain tissue. In mouse mood tests, extracts acted a little like an antidepressant. Animal results often fail to carry over to people.
No study has shown how it might affect sex drive, arousal or erections. The traditional idea was that the wood warms and strengthens the body. That is a folk explanation, not a tested mechanism.
Some sellers claim it raises testosterone. Human trials have not tested that claim.
Muira puama is sold in a few common forms:
- Dried wood chips and shavings, simmered in water - Capsules and tablets of powdered wood or root - Alcohol tinctures and liquid extracts - Concentrated dry extracts, often labelled 4:1 or 10:1
Many of the plant's compounds do not dissolve well in plain water. Traditional practice used alcohol or a long simmer for that reason.
Products vary a lot in strength. Labels often do not say which plant part was used. Some blends mix it with other herbs, which makes side effects harder to trace.
Supplements are not tested before sale in most countries. Choosing a brand that pays for outside lab testing is one way to lower the risk of a mislabelled product.
Muira puama has a long record of use in the Amazon basin. Indigenous groups in Brazil used the wood and root as a general tonic. Decoctions were taken for tiredness and for sexual complaints.
European interest began in the 1800s. The wood was shipped out and listed in British herbal texts as "potency wood". It was later sold in France as a nerve tonic.
Brazilian folk practice also used it for joint pain, upset stomach and period pain. Some healers rubbed the soaked wood on sore limbs.
These uses were written down by travellers, traders and herbalists. They were not tested in controlled studies at the time. The record tells you what people did, not what it did for them.
Stop taking it and see a doctor if you get a racing or irregular heartbeat, chest pain, fainting or unusual bruising and bleeding.
Get urgent care for chest pain, severe shortness of breath, or yellowing of the skin or eyes (a possible sign of liver trouble).
Book an appointment if low mood, tiredness or sexual problems last more than a few weeks. These need a proper check, not a supplement.
In the United States it is sold as a dietary supplement and is not reviewed for safety or effect before sale. In the UK and EU it is sold as a food supplement. It is not approved as a medicine, and it is not a controlled substance.
Evidence grades and traditional-use labels are explained in our methodology. Nothing here is medical advice.
What it is typically used for, usual dose, cautions, and the study behind it where real trial data exists.
One email with the summary. We'll also send a short weekly evidence update — unsubscribe any time.
