Damiana

What is damiana?

Damiana (Turnera diffusa) is an aromatic shrub native to Mexico, Central America and the Caribbean. Its leaves have been brewed as a tea and used in liqueurs for centuries, and damiana is one of the best-known traditional plant aphrodisiacs. It has also been used for anxiety, digestive complaints, coughs and women’s health.

What the research says

A detailed 2014 review of the Turnera genus listed many compounds in damiana, including flavonoids, cyanogenic glycosides and terpenoids, and reported antianxiety, antiaromatase, antioxidant, aphrodisiac and other activities. However, the authors noted that most of these activities had been investigated only in chemical, cell-based or animal assays. The few human studies used multi-ingredient products in which damiana was one of several active components, so damiana’s own contribution could not be determined (Szewczyk and Zidorn, 2014).

We found no clinical trials testing damiana alone for erectile function, libido, testosterone or prostate health in men. Sales pages that say damiana combined with saw palmetto works better for prostate size than either herb alone do not cite human data supporting that claim, and saw palmetto alone has shown little benefit for urinary symptoms in high-quality trials.

How it’s used in supplements

Damiana leaf is used in teas, tinctures and capsules, and appears in libido and male enhancement blends. Standardized extracts are uncommon, and typical doses have not been established through research.

Damiana appears to be well tolerated in traditional amounts, but human safety data are limited. Some animal research suggests it may lower blood sugar, so people taking diabetes medications should monitor glucose and check with their doctor. Very large amounts have been anecdotally linked to restlessness or other nervous system effects. Avoid damiana during pregnancy and breastfeeding, and stop it at least two weeks before scheduled surgery.

The bottom line: damiana has a long traditional reputation and some laboratory and animal data, but no reliable human trials on its own. In multi-ingredient men’s products, it is best viewed as a traditional flavor of the formula rather than an active ingredient with proven effects. It has no demonstrated role in prostate health or urinary symptoms.

When comparing products, note that damiana is rarely standardized, so the milligram amount on a label says little about potency. Products that rely on damiana together with other traditional aphrodisiacs, without listing amounts or citing human trials of the finished formula, are making claims that cannot be checked. Men with ongoing libido or erection concerns should see a doctor, since these symptoms can reflect heart disease, diabetes, low testosterone, depression or medication side effects.