Maca Root: Benefits, Dosage, Forms & Research

What the Research Says

Maca has a moderate evidence base, primarily from research by Gonzales and colleagues at Universidad Peruana Cayetano Heredia. The most robust finding is for libido enhancement — Shin et al. (2010) conducted a systematic review of 4 RCTs and found sufficient evidence for sexual desire improvement. For fertility, the evidence is promising but limited to small studies. A 2016 BMC Complementary and Alternative Medicine review concluded maca has potential for menopausal symptoms but called for larger, more rigorous trials. Notably, maca does not appear to alter testosterone, estrogen, or other hormone levels directly, suggesting its effects may be mediated through other mechanisms (possibly macamides acting on the endocannabinoid system).

Benefits of Maca Root

• Libido enhancement — Gonzales et al. (2002, n=57) conducted a 12-week RCT showing maca (1.5-3g/day) significantly increased sexual desire by week 8 independent of testosterone or estradiol levels
• Male fertility — Gonzales et al. (2001) found that 1.75g/day maca for 4 months increased sperm count by 20% and motility by 14% in healthy men
• Menopausal symptom relief — Brooks et al. (2008, n=14) showed 3.5g/day maca reduced anxiety, depression, and sexual dysfunction scores in postmenopausal women
• Mood and energy — Stojanovska et al. (2015, n=29) found maca reduced depression and blood pressure in postmenopausal women over 6 weeks
• Exercise performance — Stone et al. (2009) showed maca extract improved cycling time trial performance in trained male cyclists

Side Effects and Safety

Safety profile: Generally Safe

Potential Side Effects

• Mild digestive upset with raw maca powder (gelatinized form is better tolerated)
• Insomnia if taken in the evening
• Jitteriness at high doses
• Hormonal effects are subtle but possible — monitor with hormone-sensitive conditions

Drug & Supplement Interactions

• Theoretical interaction with hormone-sensitive conditions (breast, uterine, ovarian cancer; endometriosis)
• May interact with thyroid medications (maca contains goitrogens as a cruciferous plant)
• Generally safe to combine with other adaptogens
• No well-documented drug interactions at standard doses