Damiana: beyond the shop description

Damiana has one of the most confident reputations on the shelf. Look at the label and you'll see "aphrodisiac" in some form, plus a mood-lifting promise or two. So where does the reputation come from? Centuries of traditional use, a good number of rat studies and a handful of lab assays. In people, no trial of damiana on its own has turned up. Let's follow the story from the shrub to the research.

A shrub, a reputation and a lot of rats

Damiana is Turnera diffusa, a small aromatic shrub from Mexico, Central America and the Caribbean. Its leaves have a long traditional use as an aphrodisiac and tonic. In animals, some extracts changed sexual behaviour in rats and reduced anxiety-like behaviour in mice and rats. In people, the few human studies reviewed in the literature tested multi-ingredient products, so damiana's own contribution can't be separated out.

That makes damiana a traditional herb with animal and lab findings, and with benefits that nobody has yet shown in people. The sensible questions for buyers are what the product contains, what you're taking it alongside and which rules apply where you live.

The quick tour

• Plant: Turnera diffusa, a shrub; the dried leaf is the usual product. Don't confuse it with other Turnera species or with unrelated "damiana" look-alikes.
• Tradition vs evidence: the aphrodisiac reputation is old and widespread. Research support is limited to animal and laboratory work; no human trial of damiana alone turned up.
• The caffeine question: a 2026 analysis of authenticated damiana found no caffeine, although an older rat study reported it in an extract. Many articles repeat the claim.
• Cautions: animal studies found blood-sugar lowering, so people on diabetes medicines have a reason to ask a pharmacist. There are no adequate safety data for pregnancy.
• Law: in the Netherlands, damiana isn't named in the Opium Act or in the annex of the herbal-preparations decree (checked 8 October 2026). EU food status wasn't confirmed.

What damiana is

Turnera diffusa Willd. ex Schult. belongs to the genus Turnera, which has around 135 accepted species, of which about half a dozen are used in traditional medicine (Szewczyk & Zidorn, 2014, Journal of Ethnopharmacology, abstract). Damiana is the best known, and the review describes it as "one of the most highly appreciated plant aphrodisiacs". It's a shrub native to Mexico, Central America, the Caribbean and parts of South America, with small aromatic leaves and yellow flowers (general overview; encyclopaedic, not a primary source).

You may also see the older name Turnera aphrodisiaca or T. aphrodisiaca Ward in the literature. Several of the older rodent studies were published under that name, which helps when you're tracing a claim back to its source.

Traditional use

Damiana's best-known role is as an aphrodisiac, but the traditional list is wider. Szewczyk and Zidorn's review lists other uses across the Turnera genus including anaemia, bronchitis, cough, diabetes, fever, gastrointestinal complaints, pain, skin disorders and women's health problems, and records some species being used as abortives, expectorants and laxatives (abstract). Memorial Sloan Kettering's herb monograph summarises damiana as traditionally used as a diuretic, laxative, stimulant and aphrodisiac (MSKCC, updated 10 March 2023).

Azarius notes that damiana appears in traditional liqueurs such as Guaycura and that Mexican herbalists have written about it since at least the 1870s. That's a historical note from a retailer, not something traced to original sources.

Tradition tells us people have long used this plant for these purposes. It doesn't tell us whether it worked, or how much of the reputation comes from the setting, the company and expectation.

What's in damiana

The review lists flavonoids (22 different compounds in the genus), maltol glucoside, other phenolics, cyanogenic glycosides (seven), several types of terpenoid, fatty acids and caffeine for the genus as a whole (Szewczyk & Zidorn, 2014). A Mexican group reported caffeine, arbutin and flavonoids as the main compounds in an active aqueous extract (Estrada-Reyes et al., 2009). That caffeine report is what the next section is about.

The caffeine question

Many damiana articles say it contains caffeine. A 2026 paper in Planta Medica checked where that comes from. The authors reviewed the literature and concluded that the caffeine claim "largely stem[s] from erroneous or circular referencing". They then ran NMR on authenticated damiana aerial parts and seeds and found no caffeine, with a detection limit below 4 µg per daily serving (Pauli et al., 2026, abstract). The two papers pull in different directions. The 2009 result came from one extract analysed by mass spectrometry; the 2026 team tested authenticated plant material by NMR and found nothing. It's a single, new paper, so "no caffeine" is the better-supported reading for now, not a closed case. If it holds up, any "mild stimulation" users report isn't coming from caffeine in the damiana itself. It may come from a blend, or from expectation.

A commercial extract under the microscope

A 2026 Pharmaceuticals paper characterised a commercial damiana extract (Liboost) and found 49 compounds, mostly flavonoids. In human cell lines the extract reduced expression of PDE5, inhibited aromatase and moderately raised nitric oxide production. The authors say themselves that this is limited to in vitro models (Benito-Vázquez et al., 2026, abstract). It suggests mechanisms worth testing. It doesn't show an effect in people, and results from one branded extract can't be assumed for a leaf in a tea tin.

What the research shows

Most of the studies below are described from their published abstracts, so the details stay at that level.

Rodent studies of sexual behaviour

• Arletti et al. (1999, Psychopharmacology): fluid extracts of damiana and Pfaffia paniculata were given by mouth to sexually potent and sexually "sluggish" male rats. The extracts had no effect on potent rats but improved copulatory performance in sluggish ones, without changing locomotor activity (abstract).
• Estrada-Reyes et al. (2009, Journal of Ethnopharmacology): in sexually exhausted male rats, an aqueous extract increased the share of males achieving ejaculation and resuming a second series, with a comparison group on yohimbine (abstract).
• Estrada-Reyes et al. (2013): the same group reported that damiana facilitated sexual behaviour in sluggish rats in a way that sildenafil did too, and that a nitric-oxide synthase inhibitor blocked the effect, pointing to the nitric oxide pathway (abstract).

Taken together, these are three consistent rat findings, from two groups, using different extracts. They fit the traditional reputation. They don't translate into a human effect, an effective amount or a result for dried leaf tea, and the doses in these studies were calibrated per kilogram of rat body weight.

Anxiety and mood in animals

An aqueous extract produced anxiolytic-like and antidepressant-like effects in mice in a 2019 study, without changing locomotor activity, and a 28-day treatment didn't produce behavioural signs of neural side effects (Dorantes-Barrón et al., 2019). Earlier work from India found that a methanol extract and some homoeopathic mother tinctures of T. aphrodisiaca reduced anxiety-like behaviour in mice on the elevated plus-maze (Kumar & Sharma, 2005a; 2005b). Both are anxiolytic studies in mice, not evidence about aphrodisiac activity.

Blood sugar

Damiana is traditionally used for diabetes, and some laboratory work points in that direction. A compound isolated from the plant, teuhetenone A, gradually lowered glucose in normal and diabetic mice (Parra-Naranjo et al., 2017), and a 2025 cell study found an ethanolic leaf extract increased glucose uptake in muscle cells and reduced fat accumulation in fat cells (Chae et al., 2025). A 2023 review of Turnera bioactivity (92 publications) called antioxidant, hepatoprotective, neuroprotective, hypoglycaemic and aphrodisiac activities the most promising and said that clinical trials are still needed (Parra-Naranjo et al., 2023).

And in people?

Szewczyk and Zidorn report that the human work they could find tested products with damiana as one ingredient among others: a herbal preparation for weight, and a product for female sexual function. In both, the other ingredients may be active too (abstract). MSKCC likewise says small studies of formulations containing damiana have looked at weight loss and that confirmation is needed (MSKCC). The 2023 review still calls for clinical trials. A Europe PMC search on 8 October 2026 for randomised or placebo-controlled human studies turned up no trial of damiana alone, though that search wasn't exhaustive.

The label promises, next to the research

• Common claim: Aphrodisiac; Where it comes from: Tradition; rat studies; What the research shows: Rat studies are positive; no human trial of damiana alone
• Common claim: Lifts mood, reduces anxiety; Where it comes from: Tradition; mouse and rat studies; What the research shows: Animal findings only
• Common claim: "Natural Viagra" / PDE5 inhibitor; Where it comes from: In vitro work on a commercial extract; What the research shows: Cell-based; no human evidence. The comparison with sildenafil appears in rat work, not in people
• Common claim: Gentle stimulant (caffeine); Where it comes from: An older rat-study extract analysis; older reference lists; What the research shows: A 2026 NMR analysis found no caffeine in authenticated damiana
• Common claim: Helps blood sugar; Where it comes from: Tradition; mouse and cell studies; What the research shows: No human evidence; also a reason for caution (see below)

A supplier calling damiana an aphrodisiac is describing its traditional reputation (Azarius: "traditionally used across Mexico and the Caribbean as an aphrodisiac and gentle tonic"). That's a statement about tradition, and the research doesn't back it up in people.

Leaf, extract or blend?

Azarius lists two damiana products as of 8 October 2026: dried cut-and-sifted leaf and a "10x" extract. Its page mentions use as tea, in smoking blends or as a tincture for the leaf, and brewing for the extract, and adds an 18+ restriction and a standard medical disclaimer (Azarius damiana page). That's what the supplier's page says; we haven't tested the products.

Two things about formats are worth knowing:

• Leaf vs extract: a "10x" label on its own doesn't tell you the amount of any specific compound, and the animal studies above used laboratory extracts that aren't the same as shop products.
• Blends: damiana is often sold in blends, including in multi-ingredient "passion" or libido products. In a blend you can't tell which ingredient is responsible for anything you notice.

One quality question deserves mention: supplements sold for sexual enhancement have a history of being spiked with prescription erectile-dysfunction drugs. A 2026 paper developed screening methods for four such compounds in damiana-based supplements and found none in the 20 products it tested (Jiménez-Amezcua et al., 2026, abstract). Twenty products is a small sample, so it isn't a guarantee for any one product. Plain dried leaf with the Latin name on the label is simpler to assess than a branded "male enhancement" capsule. For what to look for, our guide to reading supplement labels applies to any herbal product.

Cautions and interactions

• Blood sugar medicines: animal and cell studies point to blood-sugar-lowering activity (above). Whether that matters at the amounts people use as a herbal tea hasn't been studied in people. If you use insulin or other glucose-lowering medicines, it's a question for your pharmacist or doctor, because additive effects are plausible rather than proven.
• Pregnancy and breastfeeding: no adequate human safety data turned up. Szewczyk and Zidorn note that some Turnera species have been used traditionally as abortives, though that comes from the whole genus. The reasonable position is to avoid it.
• Cyanogenic glycosides: these compounds are reported in the genus. No human toxicity data tied to damiana products turned up, so it's unclear whether they matter at normal use; they've only been identified.
• Long-term use: an animal study of a 28-day aqueous extract found no behavioural signs of neural side effects in mice. That's reassuring about acute and 28-day toxicity in mice, not a long-term human safety assessment.
• Other medicines: no systematic human interaction data exist. For help checking a specific combination, see supplements, herbs and medication.

Sexual problems can have medical causes, from stress and relationships to blood pressure, diabetes, medicines and hormones. If something has changed for you, it's worth a conversation with a doctor rather than relying on a herbal product.

Is damiana legal? The Dutch and EU position

Checked 8 October 2026. This is information, not legal advice, and laws change.

• Netherlands, Opium Act: the consolidated Opiumwet text on wetten.overheid.nl, read on 8 October 2026, doesn't mention Turnera or damiana (Opiumwet).
• Netherlands, herbal-preparations decree: the Dutch herbal-preparations decree has an annex listing plants and fungi that herbal preparations must not contain (Article 4(2); it names kava and yohimbe, for example). Damiana isn't named there (version in force since 1 July 2022, consulted 8 October 2026; text), but that is not an approval: other rules, including EU novel-food law, are separate.
• EU: we couldn't confirm the EU novel-food status of damiana, so we make no statement about it. Check the Commission's Novel Food Status Catalogue before buying. We found no EU herbal-medicine monograph for it.
• Other countries: rules differ across the EU and beyond, so check the country you're in. Health claims on food and supplements are regulated separately from the plant's legal status.

Where does that leave damiana?

Damiana is a traditional herb with a pleasant, slightly bitter flavour (according to its sellers), a long cultural history and a modest, mostly animal evidence base. The research is more interesting and less conclusive than the labels suggest: three consistent rat studies, anxiolytic-like results in mice, a caffeine claim that a 2026 analysis couldn't reproduce and no trial of damiana alone in people.

If you're curious, treat it as a herb to explore, not a treatment. Check the Latin name, know whether you're buying leaf, extract or a blend, and ask about interactions if you take medicines for diabetes or anything else.

Next reading

• How to read supplement labels
• Supplements, herbs and medication
• Smart Supplements 101
• Dream herbs explained: African dream root, seed and uvuma-omhlophe, for which plants the labels name, what the sources describe and where the research stops.

Update note: an earlier version of this article said damiana contains caffeine and cited Kumar & Sharma (2005) as evidence of aphrodisiac activity. The caffeine statement is now challenged, because a 2026 NMR analysis found no caffeine in authenticated damiana (see the caffeine section), and the Kumar and Sharma papers are anxiolytic studies in mice, so they don't support an aphrodisiac claim. This version replaces the earlier one.

Written by Smart Supplements with AI assistance from the sources linked in the text. It has not been reviewed by a clinician.

Last updated: 12 October 2026

This article is for informational purposes only and is not intended as medical advice. Always consult a healthcare professional before starting any new supplement, especially if you take prescription medication.