What the research addresses
Maca is a Peruvian plant promoted for libido, fertility and menopausal symptoms. MSK describes small human studies and limited overall evidence. Findings on semen measures are mixed, and a reported change in sexual wellbeing does not establish improved fertility. [1]
What the finding does not establish
Maca should not be described as a proven testosterone booster. MSK notes a report of interference with testosterone testing, which makes a laboratory number particularly important to interpret in context. [1]
Use the outcome that matches your goal
Suppose a hypothetical trial finds that participants rate their sexual wellbeing more favorably. It would not answer whether a couple is more likely to conceive. Nor would a semen measurement, by itself, establish a pregnancy benefit. Put the outcome you want beside the outcome the study actually measured.
That distinction helps when a product uses one favorable result to support several promises. Desire, hormone levels, semen characteristics and pregnancy are related subjects, but they are not interchangeable endpoints. A useful comparison asks whether the study addresses the specific question and whether the size of the result is meaningful.
| Hypothetical finding or choice | What it means |
|---|---|
| Improved subjective wellbeing | Not a measured pregnancy outcome |
| A changed semen parameter | Does not automatically establish fertility benefit |
| An unexpected hormone result | Consider test context and supplement interference |
Safety and treatment considerations
Reported symptoms include digestive upset, insomnia and menstrual changes; causation is not certain for every report. Tell the clinician or laboratory about maca before hormone testing. A possible interaction with losartan has been seen in animals, with uncertain relevance to people. [1]
A practical next step
No maca product or dose is recommended here. When fertility or unexpected hormone results are the concern, discuss the full clinical picture and supplement use rather than interpreting one number or testimonial alone.
Sources for this article
- Memorial Sloan Kettering Cancer Center — Maca
Source consulted: 2026-09-17. This is a reference resource, not a claim that we conducted the studies or tested a product.