What Is Maca?
Maca (Lepidium meyenii) is a root vegetable native to the high-altitude Andean plateau of Peru. It has been cultivated and consumed there for thousands of years, both as food and as a traditional remedy for energy, stamina, and reproductive health. Today, maca is sold globally as a powder, capsule, or extract, and is one of the most widely discussed natural supplements in the fertility community.
But interest in a supplement and evidence for its effectiveness are two different things. Here's an honest look at what the science currently supports.
What Maca Contains
Maca is nutritionally dense, containing:
- Carbohydrates and fibre
- Proteins and amino acids
- Vitamins including B vitamins, vitamin C, and copper
- Minerals including zinc, iron, and manganese
- Unique compounds called macamides and glucosinolates, which are believed to be responsible for many of its biological effects
Importantly, maca does not directly contain hormones, but it is thought to work as an adaptogen — a substance that may help the body regulate its own hormonal systems.
Evidence for Maca in Male Fertility
This is where the more credible research exists. Several small studies have examined maca's effects on sperm parameters in men:
- Some studies report improvements in sperm concentration and motility after supplementation over several months
- One often-cited study found increases in sperm count and motility in healthy men after taking maca for four months
- Some research suggests benefit for men with mild to moderate sperm parameter issues
The caveat: Most studies are small, of short duration, and not always double-blind or placebo-controlled. The evidence is interesting, but not yet conclusive. It is not a replacement for medical investigation or treatment of significant male factor infertility.
Evidence for Maca in Female Fertility
The evidence here is less developed:
- Some research in animals showed improvements in egg quality and ovarian function, but animal studies don't always translate to humans
- Limited human studies suggest maca may help with menopausal symptoms (hot flashes, mood), possibly by supporting hormonal balance
- There is some theoretical interest in maca for women with hormonal imbalances contributing to irregular cycles
There are currently no large, high-quality clinical trials demonstrating that maca directly improves pregnancy rates in women.
Maca and Libido
One area with more consistent evidence is maca's potential effect on libido and sexual function in both men and women. Multiple studies have found improvements in self-reported sexual desire, and this effect appears relatively well-supported compared to the fertility-specific claims. While improved libido doesn't directly equal improved fertility, it's a practical benefit for couples under the stress of trying to conceive.
Is Maca Safe?
For most healthy adults, maca appears to be generally safe when taken in food-appropriate amounts. However:
- Those with thyroid conditions should be cautious — maca contains goitrogens, which may interfere with thyroid function in large amounts
- Those with hormone-sensitive conditions should consult their doctor before use
- Safety during pregnancy and breastfeeding has not been well studied — most practitioners advise caution or avoidance after a positive pregnancy test
- Always inform your fertility specialist of any supplements you are taking
How to Think About Maca in Context
Maca is not a miracle cure, and it should not be used as a reason to delay seeking proper medical investigation. However, as part of a broader approach to supporting overall health — good nutrition, stress management, quality sleep, avoiding smoking — maca may have a modest supporting role, particularly for men with mild sperm concerns or individuals experiencing stress-related hormonal disruption.
Always discuss supplements with your fertility doctor. What seems harmless can occasionally interact with medications or protocols.
The Bottom Line
Maca is a nutritious, generally safe food supplement with some promising early research — particularly for male sperm parameters and libido. The evidence is not strong enough to make confident fertility claims, but it's also not so weak that it should be dismissed entirely. Approach it with realistic expectations and open communication with your healthcare team.