Maca root (Lepidium meyenii) is a cruciferous vegetable native to the Peruvian Andes that has been used for centuries as a food and traditional medicine. In recent decades, it has gained worldwide popularity as a natural libido and fertility enhancer. But what does the actual science say?
Key Takeaway: Maca root has consistent clinical evidence for improving libido and sexual function in men. Unlike many other male health supplements, Maca does not appear to affect testosterone levels directly — it works through other mechanisms.
What Maca Does — and Doesn't — Do
Unlike Tongkat Ali or Ashwagandha, Maca doesn't directly boost testosterone. Instead, research suggests it works by improving mood, reducing anxiety, and enhancing the subjective experience of desire. This makes it unique among male performance supplements and potentially useful for men whose low libido is related to stress or psychological factors rather than hormonal issues.
Clinical Evidence
Several randomized controlled trials have examined Maca's effects on sexual function. A 2010 meta-analysis found that Maca consistently improved subjective libido and sexual desire compared to placebo. Studies typically use 1.5-3g of gelatinized Maca powder daily for 8-12 weeks. A 2015 study specifically found improved sexual desire in men taking Maca, without any changes in serum testosterone or estrogen levels.
Fertility Benefits
Maca also shows promise for male fertility. Multiple studies have found improvements in sperm count, sperm motility, and semen volume with Maca supplementation. These effects may be related to Maca's high content of beneficial plant compounds, amino acids, and minerals rather than hormonal pathways.
Types of Maca
Maca comes in several varieties (yellow, red, black) based on root color. Black Maca is generally considered the most effective for male fertility and athletic performance. Red Maca may be better for prostate health. Most supplements use a blend of all three. Gelatinized Maca (which removes some of the starch) is easier to digest and more concentrated than raw Maca powder.
How to Use Maca
Typical dosage is 1.5-3g per day of gelatinized Maca powder, or 500-750mg in capsule form. Maca is generally very well-tolerated with minimal side effects. Some people notice a distinct taste and smell — capsules can help avoid this. Consistency matters; noticeable effects typically appear after 4-8 weeks of daily use.