Maca Root for Men: Separating Fact from Supplement Hype

Maca root has a real, if modest, body of evidence behind it. Small clinical trials suggest it can improve libido in men and may support sperm quality. What it cannot do is reliably treat erectile dysfunction or raise your testosterone. If you are buying it based on those claims, you are likely to be disappointed.

What maca may genuinely do for men#

Libido is the area with the most consistent data. A 2010 systematic review by Shin et al., published in BMC Complementary and Alternative Medicine, found that four placebo-controlled trials (131 participants combined) reported improved sexual desire after at least six weeks of maca supplementation. The studies were small and the authors were clear that the evidence was not strong enough to draw firm conclusions.

Fertility is another area with some support. A 2022 meta-analysis in Frontiers in Pharmacology (Lee HW et al.) pooled data from several small trials and found modest improvements in sperm concentration and motility. The absolute effect sizes were small, and the studies varied considerably in design.

For men experiencing SSRI-induced sexual dysfunction, maca has specific preliminary evidence. A small randomised trial by Dording et al. (2008), published in CNS Neuroscience & Therapeutics, found that 3g of maca daily reduced sexual dysfunction caused by antidepressants. This is one of the more plausible and underserved uses, though it remains an early-stage finding and patients should never adjust their antidepressant dose without clinical guidance.

Does maca raise testosterone?#

No. Studies consistently show that maca does not raise serum testosterone levels. It contains glucosinolates, plant compounds that may influence how the body responds to androgens. Some researchers have tentatively hypothesised that this could affect androgen sensitivity or downstream hormonal signalling, though this remains speculative and is not yet confirmed in human trials. The practical implication is that maca is not a testosterone booster, even if some supplement labels imply otherwise.

Black, red, and yellow maca: does the colour matter?#

Yes, to some extent. Black maca has the most evidence for sperm quality and energy. Red maca has been studied more in relation to prostate health, though the available evidence comes from animal studies only, suggesting it may reduce prostate size in testosterone-induced benign prostatic hyperplasia; no human trial data currently supports this use. Yellow maca is the most widely sold and has a broader general evidence base. For men focused on libido and sperm health, black or yellow are the better-studied options.

Dose and timing#

Most clinical trials used 1.5g to 3g of whole maca powder daily. Products labelled as extracts (for example, a 10:1 extract) are more concentrated — a 500mg capsule of a 10:1 extract is equivalent to approximately 5g of raw maca powder, which is well above the doses used in most trials. Read the label carefully, or ask to see the product's Certificate of Analysis.

Expect to wait at least 6 to 12 weeks before judging whether maca is doing anything. Studies that showed a libido benefit ran for six weeks at minimum. Anything claiming faster results is not supported by trial data.

Gelatinised vs raw maca powder#

Gelatinised maca has been heat-processed to remove starch. Manufacturers widely report that this improves tolerability for people with sensitive digestion. Whether it improves absorption compared to raw powder has not been confirmed in comparative human pharmacokinetic studies. If raw maca causes bloating, gelatinised is a reasonable switch.

Safety, side effects, and drug interactions#

Maca is well tolerated in short-term studies. No liver toxicity has been identified in human clinical trials to date, though long-term safety data beyond 12 weeks is limited. The most common side effects reported are mild digestive discomfort, particularly with raw powder.

No interactions with sildenafil, tadalafil, or antihypertensives have been identified. That said, maca does have mild hormonal activity. If you take any regular prescribed medicines, including hormone-sensitive treatments, tell your GP before starting it.

Buying maca in the UK#

Maca is classified as a food supplement by UK law. The MHRA does not regulate it as a medicine, meaning manufacturers cannot legally make health claims on UK packaging. There is no NHS endorsement for maca for any condition.

When buying, look for GMP (Good Manufacturing Practice) certification and Soil Association organic accreditation. A 10:1 extract ratio on the label means the product is more concentrated than plain powder. Check that the supplier publishes a Certificate of Analysis.

If libido or sexual function is your concern, our guide to foods that can help boost your libido naturally covers the broader dietary evidence alongside supplements like maca.