Maca
Also known as: Lepidium meyenii, Peruvian ginseng, Maca root powder
The high-altitude Peruvian root marketed for libido and energy — evidence is suggestive but thin.
In short
Maca (Lepidium meyenii) is a cruciferous root vegetable grown at extreme altitude in the Peruvian Andes, where it has been a staple food and traditional tonic for centuries. Supplements made from dried maca root are marketed for libido, fertility, and energy. The clinical evidence is limited and mixed: a few small trials suggest possible improvements in sexual desire and mood, but studies are short, small, and inconsistent — maca is safe and food-like, just far from proven.
- Root vegetable from the high Andes (a relative of broccoli)
- Traditional staple food and vitality tonic in Peru
- Marketed for libido and energy; evidence is small and mixed
- Powder, capsules, and 'gelatinized' (cooked) forms
What is Maca?
Maca grows where almost nothing else will — above 4,000 meters in the Peruvian Andes — and its hardiness became its reputation: a vitality tonic for the people who cultivate it. It is genuinely nutritious, a cruciferous root rich in minerals and bioactive compounds, which makes it a reasonable food. The supplement claims, chiefly libido and fertility, rest on small trials with modest effects — enough to keep researchers interested, not enough to make maca a first-line anything.
Where it comes from
Natural sources
- Root of Lepidium meyenii, cultivated in the central Peruvian Andes
- Eaten cooked as a staple food for centuries
- Colors: yellow, red, and black maca (with slightly different compounds)
How it's made
Supplements use dried, milled root powder; 'gelatinized' maca is pre-cooked to remove starch and ease digestion.
What it does in products
Benefits
Sexual desire
emerging evidenceA handful of small trials report improved libido scores in men and women — but effect sizes are modest and studies short; the evidence is suggestive rather than conclusive.
Mood and energy
emerging evidenceSome trials found improved mood and reduced fatigue with 1.5–3 g daily; results are inconsistent across studies.
Fertility
emerging evidencePreliminary studies suggest possible improvements in semen parameters, but the literature is too small and short for firm conclusions.
Nutritional food value
strong evidenceAs a food, maca provides minerals, fiber, and protein — its least hyped and most solid contribution.
Side effects & safety
Safety considerations
- Traditional Peruvian practice avoids maca in pregnancy; limited modern data — best avoided.
- Possible additive effects with thyroid medication (goitrogen content) — monitor if relevant.
- No major documented drug interactions.
- Not for: Thyroid disease (caution, goitrogen content)
- Not for: Hormone-sensitive conditions (theoretical estrogenic activity)
How it's used
In supplements
Trial doses range 1.5–3 g daily of powder (usually gelatinized) or 450–1,500 mg extract. Effects, when reported, appear over 6–12 weeks. Choose gelatinized powder if raw starch causes bloating.
Regulatory status
- Dietary supplement under DSHEA; maca has GRAS status for food use in limited applications.
- GRAS (generally recognized as safe) for food use.
Popular products containing Maca
- Organic Maca Powder — GelatinizedNavitas Organics · Supplement
- Maca Root CapsulesNOW Foods · Supplement
- Maca Root ExtractGaia Herbs · Supplement
Product names and brands are shown for reference and belong to their respective owners.
Yellow, red, and black maca
Maca's three color varieties are chemically distinct: red maca has the most human data for prostate-related outcomes and mood, black maca for physical performance in animal models, and yellow is the general staple. Most human libido trials used a mix. The color differences are real but subtle; product standardization and gelatinization matter more than shade for most users.
Frequently asked questions
Does maca really increase libido?
Maybe, modestly. Small trials show improved desire scores in some men and women, but the studies are short and inconsistent. Maca is worth trying for interest in libido support — with honest expectations — but it is not a hormone replacement or medication.
Is raw or gelatinized maca better?
Gelatinized (pre-cooked) maca is gentler on digestion because the starch is broken down, and it is the form used in most Peruvian consumption. Raw powder causes bloating in some people.
Does maca affect hormones?
Despite the marketing, maca does not appear to raise testosterone or estrogen in humans — its effects are considered adaptogenic rather than hormonal. That is actually reassuring: no hormonal side effects have been documented.
The bottom line
Maca is a nutritious Andean food with a plausible-but-thin supplement résumé: possible modest libido and mood support, no hormonal action, and a good safety record. Choose gelatinized powder, expect gradual effects, and treat it as an experiment, not a guarantee.
References
- Maca and sexual function — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=maca+sexual+desire+randomized
- Lepidium meyenii (maca) review. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=Lepidium+meyenii+review
- Maca compound records. PubChem (National Library of Medicine). https://pubchem.ncbi.nlm.nih.gov/#query=Lepidium%20meyenii
- Maca and mood — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=maca+mood+anxiety