Maca is one of the most marketed herbs in the testosterone supplement space. You see it in countless male enhancement products, often placed front-and-center alongside tongkat ali and fenugreek with the implicit claim that it raises testosterone. The reality is more complicated.
Maca is a genuine adaptogen with real research behind it. But the research does not support the testosterone-boosting claim that supplement companies have built around it. Here is what the science actually says.
What Maca Is
Maca (Lepidium meyenii) is a cruciferous vegetable grown in the high Andes of Peru, at altitudes above 4,000 meters. It has been cultivated for over 2,000 years and was historically used as a food and medicinal plant by indigenous peoples. The root is the part used, typically dried and powdered.
What makes maca interesting from a research perspective is its classification as an adaptogen — a substance that helps the body resist physical, chemical, or biological stress without disrupting normal physiological function. This is a different category from hormone-boosting ingredients.
The Research on Maca and Testosterone
This is where the disconnect between marketing and evidence becomes clear.
Multiple human studies have examined maca’s effects on sexual function and hormone levels. The findings are consistent: maca improves sexual desire and function, but it does not increase testosterone levels.
A 2001 study in Andrologia gave men 1,500mg or 3,000mg of maca extract daily for 12 weeks. Both groups showed significant improvements in sexual desire compared to placebo, starting at week 8. Importantly, serum testosterone, LH, FSH, and prolactin levels were unchanged. The improvement in sexual function occurred without any change in reproductive hormones.
A 2002 study in the Journal of Urology examined men with SSRI-induced sexual dysfunction. Maca improved sexual desire and function while testosterone and estradiol levels remained unchanged.
A 2010 review in BMC Complementary and Alternative Medicine examined all available human trials on maca and sexual function. Conclusion: maca has a significant effect on sexual desire in men. The mechanism is unknown but appears independent of testosterone and other gonadal hormones.
How Maca Works — The Current Understanding
Since maca does not raise testosterone, how does it improve sexual function?
The leading hypothesis involves neurotransmitter effects. Maca contains compounds called macaenes and macamides that appear to influence the hypothalamus-pituitary axis and possibly through effects on dopamine and other neurotransmitters involved in sexual motivation.
Another hypothesis involves mitochondrial energy production. Maca grows at extreme altitude and has evolved compounds that support cellular energy metabolism. This adaptogenic effect may improve physical stamina and subjective energy, which in turn supports sexual function.
Types of Maca
Not all maca is the same. The three main types:
- Yellow maca — the most common, most studied for general health
- Red maca — considered most potent, strongest adaptogenic properties. A 2009 study found red maca had the strongest effects on prostate health in rats.
- Black maca — considered most energizing, some evidence for memory and learning effects in animal studies.
Most supplements use yellow maca. The research on sexual benefits does not consistently distinguish between types.
Who Should Take Maca
Based on the evidence, maca is appropriate for:
- Men with low libido but normal testosterone — maca’s direct neurotransmitter effect on sexual motivation may help even though it does not change T levels.
- Men experiencing sexual side effects from medications — particularly SSRIs, where the mechanism overlaps with maca’s proposed dopaminergic effect.
- Men looking for adaptogenic support — improved energy, better response to stress, general vitality.
For men specifically looking to raise low testosterone: maca is not the right ingredient.
Dosing
Studies used 1,500-3,000mg of maca root daily. The 3,000mg dose showed effects in the 12-week study, with benefits emerging around week 8. Maca requires several weeks of consistent use before effects are noticeable.
Maca and Testosil
Testosil contains 500mg of maca root per serving — notably lower than the 1,500-3,000mg studied. The amount in Testosil may provide some adaptogenic and libido support, but it is at the low end of the studied range. For men targeting low libido or sexual function, a standalone maca supplement at 1,500-3,000mg daily is more likely to produce effects.
The Bottom Line
Maca is a legitimate adaptogen with real effects on sexual desire and function. But it is not a testosterone booster. It does not increase testosterone production, and the mechanism appears to be neurotransmitter-based rather than hormonal.
If you have normal testosterone but low sexual desire: maca is worth trying. If you have genuinely low testosterone: address the root cause with ingredients that have direct T-elevating effects.
