Maca Root: Benefits, Evidence, and How to Use It

Maca has a 2,000-year reputation for energy and libido. Here's what the science actually shows, why it works without changing your hormones, and how to use it sensibly.

Maca has a big reputation. For thousands of years, this root from the high Peruvian Andes has been used for energy, stamina, and sex drive, and today it's one of the most popular natural libido supplements in the world. So here's the question worth answering honestly: does the science back up the legend?

The short version is more interesting than a simple yes or no. Maca has real, if modest, human evidence, most consistently for sexual desire in both men and women, and it appears to work in a genuinely surprising way: without changing your testosterone or estrogen at all. Here's what the research actually shows, and how to use maca sensibly.

Key points

Maca (Lepidium meyenii) is an Andean root vegetable with encouraging but limited human evidence. Its most consistent benefit is a modest boost in sexual desire, in men and women, and unlike many "libido" or "testosterone" products, it does this without raising testosterone or estrogen. There's promising early evidence for menopausal symptoms and mood in women, energy and stamina, and sperm quality in men, though most studies are small. It's generally well tolerated at the doses used in research, but there are real cautions worth knowing, especially around thyroid conditions and supplement quality.

What is maca?

Maca is a root vegetable native to the high-altitude Peruvian Andes, where it has been eaten and used for energy, fertility, and stamina for over two thousand years. Botanically it's a cruciferous vegetable, in the same family as broccoli, cabbage, and kale, which matters for its safety profile later on. The root is dried and sold as a powder or in capsules.

It comes in a few colors, mainly yellow, red, and black. Yellow is the most common and most studied for general use; black maca has the most evidence for sperm quality and energy; red maca has been looked at for prostate health. For general libido support, all three appear to help.

How maca works

This is where maca surprises people. Most clinical trials find that maca does not meaningfully change testosterone, estrogen, or other sex hormones, even when the people taking it report better libido or energy. In other words, claims that maca "boosts testosterone" are not supported by the evidence.

So how does it work? Researchers think the effects come through non-hormonal pathways. Maca contains unique compounds called macamides and macaenes, found in no other plant, along with other bioactive substances that may influence neurotransmitter systems tied to mood and sexual desire. It's often called an adaptogen, though it seems to work differently from stress-focused adaptogens. The honest answer is that the exact mechanism isn't fully pinned down, but the "it doesn't change your hormones" finding is consistent and important, because it sets realistic expectations for what maca can and can't do.

Maca and libido

Libido is where maca has its strongest and most consistent evidence. A systematic review of randomized controlled trials concluded there is limited but real evidence that maca improves sexual desire, in both men and women. In one well-known trial, men taking maca reported increased sexual desire after about eight weeks compared with placebo, with no change in their testosterone or estradiol.

The evidence for erectile function is thinner but promising: a 2023 randomized trial found that gelatinized maca improved erectile function in men with late-onset low testosterone over 12 weeks, though the study was small. Being straight about it: the trials are small and short, and a couple of reviews caution that the evidence isn't strong enough to call maca a reliable libido fix. It's best described as the most consistent natural option for desire, with modest evidence behind it, not a guarantee.

One practical detail: maca takes time. Across studies, desire tends to improve gradually, with little happening in the first few weeks and more noticeable changes around six to eight weeks of daily use.

Maca for women and menopause

For women, some of the most interesting research is around the menopause transition. A review of maca for menopausal symptoms concluded it shows potential but called for larger, better-quality trials. In one study of postmenopausal women, maca reduced psychological symptoms including anxiety and depression, and improved measures of sexual function, and notably, the researchers found these benefits were not related to estrogen or androgen changes, consistent with maca's non-hormonal profile.

That makes maca an appealing option for women looking for a natural addition during perimenopause and menopause, especially for desire and mood. As always, the evidence is early and the studies small, so it's a reasonable thing to try alongside the fundamentals, not a replacement for medical care when symptoms are significant.

Maca for energy and stamina

Maca's traditional reputation is as an energy and stamina root, and there's some supporting evidence, though it's more limited than the libido research. A few studies suggest maca may support physical performance and endurance, and many people report an energy lift, which some studies note can appear earlier than the libido effects. The research here is smaller and less consistent, so treat the energy benefit as plausible and worth trying rather than firmly established.

Maca and fertility

In men, several small studies suggest maca may improve sperm quality, including sperm concentration and motility, with black maca showing the most promise. This is an active area of research, but the studies are small and more rigorous trials are needed before drawing firm conclusions.

How to take maca

A few practical points from the research:

• Dose. Studies most often used around 1.5 to 3 grams of maca per day. That's the studied range; more is not necessarily better.
• Form. Maca is sold raw or gelatinized. Gelatinized maca is heat-processed to remove much of the starch, which makes it easier to digest and lowers its goitrogen content (relevant for thyroid, below). Raw maca can cause gas or bloating in some people.
• Extract labels. You'll also see maca sold as a concentrated extract with a ratio like "10:1." That number describes how the extract was made, not how strong or effective it is, and it's easy to misread. Our guide to what "10:1 extract" and "dry herb equivalent" really mean explains how to read those labels.
• Timing. Give it time. Energy effects may show up within a few weeks, but libido and mood benefits typically take six to eight weeks of consistent daily use.

Is maca safe?

Maca is a food and is generally well tolerated at the doses used in studies. That said, there are genuine cautions worth taking seriously, and many articles skip them:

• Thyroid conditions. Because maca is cruciferous, it contains goitrogens, compounds that can interfere with the thyroid's iodine uptake, particularly in raw form and larger amounts. If you have a thyroid condition such as hypothyroidism or Hashimoto's, choose gelatinized maca, avoid large raw doses, and talk to your clinician first. Maca is not a substitute for thyroid treatment.
• Hormone-sensitive conditions. Maca usually doesn't change sex hormones, but a few studies have noted mild shifts, so if you have a hormone-sensitive condition (such as certain breast, uterine, or ovarian conditions, endometriosis, or fibroids), check with your clinician before using it.
• Pregnancy, breastfeeding, and children. There isn't enough safety data in these groups, so maca is best avoided unless a clinician advises otherwise.
• Quality matters. Because maca is a root grown in soil, there have been reports of heavy-metal (including lead) contamination in some products. This is a strong reason to choose supplements that are third-party tested by an independent lab.
• Medications. Data on interactions is limited; if you take thyroid, hormone, or other regular medications, run it by your clinician.

None of this means maca is dangerous for most healthy adults. It means, like anything you take regularly, it's worth using thoughtfully and choosing a tested product.

Does the research apply to a maca supplement?

Here's a point that's easy to miss and important to be honest about: evidence for maca as an ingredient does not automatically prove that any given maca-containing product works the same way. Results depend on the form, the dose, the quality, and how it's combined with other ingredients, and a finished multi-ingredient formula hasn't usually been tested as a whole.

For transparency: our own Vitalitas for Men and Vitalitas for Women formulas include maca alongside other traditionally used herbs, for energy, vitality, and libido support. The ingredient research above is encouraging, but we'd rather set an honest expectation: a supplement is one supportive tool, results vary, and maca in particular works gradually and without changing your hormones. It's a complement to good sleep, activity, and stress management, not a replacement for them.

Conclusion

Maca is one of the more credible natural options for libido, with modest but real human evidence in both men and women, plus promising early research for menopausal symptoms, mood, energy, and fertility. Its standout feature is that it appears to support desire without touching your hormones, which also means realistic expectations matter: it works gradually, the effects are modest, and it's a complement rather than a cure. Choose a tested product, give it six to eight weeks, and check with your clinician first if you have a thyroid or hormone-sensitive condition.

Frequently asked questions

Does maca actually work for libido?

There's limited but genuine human evidence that maca improves sexual desire in both men and women, and it's the most consistent finding in the research. The studies are small and the effect is modest, so it's best seen as a promising natural option rather than a guaranteed fix. It typically takes six to eight weeks to notice.

Does maca increase testosterone?

No. Most clinical trials find maca does not change testosterone or estrogen, even when people report better libido or energy. It appears to work through non-hormonal pathways, so claims that maca "boosts testosterone" are not supported by the evidence.

How long does maca take to work?

Give it time. Energy effects may appear within a few weeks, but libido and mood benefits usually take around six to eight weeks of consistent daily use, since maca seems to work gradually rather than as an instant stimulant.

How much maca should I take?

Studies most often used about 1.5 to 3 grams per day, which is a reasonable guide. More isn't necessarily better. Gelatinized maca is easier to digest than raw, and if you're using a concentrated extract, the ratio on the label describes how it was made, not how strong it is.

Is maca good for menopause?

It's promising. Some studies in postmenopausal women found maca reduced anxiety and depression symptoms and improved sexual function, without changing hormone levels. The evidence is early and the trials small, so it's a reasonable natural option to try, not a replacement for medical care when symptoms are significant.

Is maca safe?

For most healthy adults, maca is well tolerated at studied doses. But choose gelatinized maca and consult a clinician if you have a thyroid condition, be cautious with hormone-sensitive conditions, avoid it in pregnancy and breastfeeding, and pick a third-party-tested product to reduce the risk of heavy-metal contamination.

Sources

Shin BC, Lee MS, Yang EJ, Lim HS, Ernst E. Maca (L. meyenii) for improving sexual function: a systematic review. BMC Complementary and Alternative Medicine, 2010 (limited evidence for improved sexual desire in men and women). https://pmc.ncbi.nlm.nih.gov/articles/PMC2928177/

Gonzales GF, et al. Effect of Lepidium meyenii (maca) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men, 2002 (increased desire with no change in testosterone or estradiol).

Lee MS, et al. Maca (Lepidium meyenii) for treatment of menopausal symptoms: a systematic review. Maturitas, 2011 (potential benefit for menopausal symptoms; larger trials needed).

Brooks NA, Wilcox G, Walker KZ, Ashton JF, Cox MB, Stojanovska L. Beneficial effects of Lepidium meyenii (maca) on psychological symptoms and measures of sexual dysfunction in postmenopausal women are not related to estrogen or androgen content. Menopause, 2008.

Randomized controlled trial of gelatinized maca for erectile function in men with late-onset hypogonadism, 2023 (improved erectile function over 12 weeks; small sample).

Medical News Today. 8 health benefits of maca root (overview of libido, ED, energy, fertility evidence and its limits). https://www.medicalnewstoday.com/articles/322511

Safety and goitrogen context for cruciferous plants and maca (thyroid caution, gelatinized vs raw, quality/heavy-metal considerations); consult a qualified clinician before use.