Maca root and powder, a key ingredient in Erectimus herbal supplement

Maca Root for Men: Libido, Erectile Function and What the Evidence Shows

What is maca root good for? Research shows maca root may support male libido, mild erectile dysfunction, semen quality, and energy, without directly increasing testosterone.[1], [2], [5]

Maca (Lepidium meyenii) is a Peruvian root used as food and as a natural supplement for male performance. Controlled trials suggest benefits for sexual desire, mild ED, and semen parameters. Safety is generally good at typical study doses. Erectimus includes Maca Root as one of its four plant-based ingredients.

Key Takeaways

  • Libido: Increased sexual desire after 8 to 12 weeks in RCTs.[1]
  • Mild ED: Improved erectile function scores versus placebo.[2]
  • Semen quality: Some trials show higher count and motility; evidence is mixed overall.[4], [5]
  • Hormones: Effects appear independent of testosterone changes.[1], [6]
  • Typical dosing: 1.5 to 3 g per day for 8 to 12 weeks.[1], [2], [4]

Clinical Evidence at a Glance

Outcome Study Design Key Finding Typical Dose Evidence Grade
Libido RCT, 12 weeks Increased self-reported sexual desire vs placebo; testosterone unchanged[1] 1.5 to 3 g/day Moderate
Mild erectile dysfunction RCT, 12 weeks Improved IIEF scores vs placebo[2] 2.4 g/day Moderate
Sperm count and motility RCTs, up to 16 weeks Increases in some trials; mixed across systematic review[4], [5] 1.5 to 3 g/day Low to moderate
SSRI-related sexual dysfunction Pilot RCT Preliminary signal of benefit; small sample[10] 1.5 to 3 g/day Preliminary
Testosterone Multiple RCTs No significant change across controlled studies[1], [6] Any Consistent finding

What the Evidence Shows

Libido

A 12-week randomized, double-blind trial in healthy men found higher self-reported sexual desire with maca versus placebo, without changes in testosterone or mood.[1]

Mild Erectile Dysfunction

Men with mild ED taking 2.4 g/day maca for 12 weeks improved more on erectile function scales than placebo. For a full overview of the ingredients in Erectimus and the research behind them, see the Herbal Ingredients page.[2]

Semen Parameters

Small trials report increases in semen volume, sperm count, and motility after 1.5 to 3 g/day for up to 16 weeks, though systematic reviews rate the total evidence as limited by size and heterogeneity.[4], [5]

Systematic Reviews

  • Sexual function: Signals of benefit exist, but more rigorous trials are needed.[3], [7]
  • Semen quality: Mixed results across small RCTs; further high-quality studies required.[5]

Special Case: SSRI-Related Sexual Dysfunction

A pilot RCT suggested maca may help SSRI-induced sexual dysfunction, but sample sizes were small; treat as preliminary.[10]

How Maca Root Works

Maca root contains a group of bioactive compounds unique to the species: macamides and macaenes, alongside glucosinolates and alkaloids.[13], [11] Macamides are N-benzyl fatty acid amides. Research indicates they inhibit fatty acid amide hydrolase (FAAH), the enzyme that breaks down endogenous cannabinoids such as anandamide. By reducing this breakdown, macamides are thought to sustain endocannabinoid signalling, which modulates sexual motivation, mood, and stress response through CB1 and CB2 receptors.[13]

This pathway operates independently of the hypothalamic-pituitary-gonadal (HPG) axis, which is why maca consistently improves sexual outcomes in RCTs without altering serum testosterone or other sex hormones.[6] The practical implication: maca root is not a testosterone booster. It addresses libido and mild ED through a separate mechanism, which makes it relevant for men whose sexual performance concerns are not primarily hormonal in origin.

Does Maca Raise Testosterone?

No. Across controlled studies, maca improved sexual outcomes without increasing serum testosterone or other sex hormones. The mechanism is non-androgenic, working through endocannabinoid modulation rather than direct stimulation of the HPG axis.[1], [6] Men seeking a testosterone-raising intervention will need to look elsewhere. Maca targets desire and function through a different route.

Does Maca Colour Matter?

Maca is sold in yellow, red, and black varieties. Yellow maca is the most widely studied and the form used in most of the RCTs cited above. Red and black maca have distinct phytochemical profiles and some early evidence suggests differentiated effects: black maca shows stronger signals for sperm production and cognitive function, while red maca has been studied for prostate health and bone density. None of these colour-specific findings are supported by the same volume of evidence as yellow maca for libido and mild ED. For general male sexual performance, yellow or mixed maca from a tested source remains the evidence-based choice.[7], [14]

Dosing and Forms

  • Amount: Start 1.5 g/day, consider up to 3 g/day if tolerated and needed for 8 to 12 weeks.[1], [2], [4]
  • Form: Gelatinized powder or standardized extract improves digestibility and reduces goitrogens compared with raw powder.[11]
  • Timing: Take with food to limit GI upset.
  • Onset: Expect any effect after 6 to 8 weeks of consistent use.[2]

Safety and Who Should Avoid It

  • General: Trials and reviews report good tolerance; occasional GI symptoms or headache.[7], [8]
  • Liver: No convincing link to clinically apparent liver injury per NIH LiverTox.[9]
  • Thyroid: As a crucifer, maca contains goitrogens; processing lowers content. Use caution with thyroid disease and ensure adequate iodine intake.[11]
  • Medications and conditions: Discuss use if you have hormone-sensitive conditions or take prescription treatments for ED or depression.[12] Read the full Erectimus Medical Disclaimer before use.

Choosing a Quality Product

  • Origin: Peruvian-sourced with transparent supply chain.
  • Processing: Prefer gelatinized or heat-treated maca for better tolerance.[11]
  • Testing: Look for third-party certificates covering identity, potency, heavy metals, and microbiology.[12]
  • Standardization: Brands reporting macamide and macaene levels or offering batch COAs provide clearer quality signals.[13]

Practical Plan

  1. Pick a gelatinized maca from a brand that publishes COAs and confirms Peruvian origin.[11], [12]
  2. Take 1.5 g/day with food for 2 weeks, then 3 g/day if tolerated.[1], [2]
  3. Track libido or erectile function using a simple 1 to 10 self-rating at the same time each week. A meaningful improvement is a consistent 2-point increase maintained across 3 or more consecutive weeks.
  4. Reassess at week 8. If no change is apparent by week 10, discontinue. The RCT evidence does not support continuing beyond 12 weeks without a measurable response.
  5. Maintain sleep quality, resistance training, and cardiovascular health alongside supplementation. Maca addresses one input; these fundamentals address the others.
  6. If you take SSRIs or other medications that affect sexual function, discuss use with a doctor before starting.[10]

Frequently Asked Questions

How long until I notice effects?

Typically 6 to 8 weeks for libido or ED outcomes in studies. Men who notice no change by week 10 are unlikely to respond.[2]

Does maca root work immediately?

No. Unlike prescription ED medications, maca does not produce an acute effect within hours. It requires consistent daily use over weeks to accumulate sufficient macamide levels and modulate the relevant pathways.[13]

Maca root vs ashwagandha for men: which is better?

They address different targets. Maca root has the stronger direct evidence for libido and mild ED. Ashwagandha has stronger evidence for stress reduction, cortisol modulation, and some testosterone support. For men whose primary concern is sexual desire and erectile function, maca is the better-evidenced option. For men whose primary concern is stress-related fatigue affecting performance, ashwagandha may be more relevant. They are not mutually exclusive.

Can I take maca every day?

RCTs have used daily dosing for up to 16 weeks with no significant safety signals. No long-term controlled safety data beyond this duration exists. Current evidence supports daily use for a defined trial period of 8 to 12 weeks rather than indefinite supplementation.[7], [8]

Is maca root suitable for men over 50?

There is no evidence that age is a contraindication. The Gonzales 2002 trial included men of varying ages and found libido benefits without hormonal changes.[1] Men over 50 with thyroid conditions, cardiovascular disease, or prostate concerns should discuss use with a doctor before starting, as applies to any supplement.

Which colour of maca is best for men?

Yellow maca is the most studied and the form used in the major libido and ED trials. Black maca has early evidence for sperm parameters and cognitive function. Red maca has been studied for prostate and bone health. For male sexual performance specifically, yellow or mixed maca from a tested source has the strongest evidence base.[7], [14]

Can I stack maca with other supplements?

Yes, but prioritize fundamentals and choose independently tested products.[12] Erectimus combines Maca Root with Panax Ginseng, Damiana, and Ginkgo Biloba, each selected on the basis of available clinical evidence.

Will maca boost testosterone?

No. Benefits do not depend on higher testosterone levels. Maca works through endocannabinoid modulation, not the HPG axis.[1], [6]

Conclusion

Maca root remains a well-evidenced choice for men's sexual performance. It has consistent signals for improving libido and mild erectile dysfunction, operates through a non-hormonal mechanism, and carries a good safety profile at study doses. The mechanism is distinct from testosterone stimulation, making it relevant for men whose issues are not primarily hormonal. For men seeking a plant-based option, maca root holds more clinical support than most herbal alternatives in this category.

Erectimus includes Maca Root as one of its four key ingredients. See the full Herbal Ingredients page for details on all four and the research behind each.

References

  1. Gonzales GF, et al. Effect of Lepidium meyenii on sexual desire in men. Fertil Steril. 2002. PubMed
  2. Zenico T, et al. Efficacy of maca extract in patients with mild erectile dysfunction: a randomized, double-blind pilot study. Andrologia. 2009. Wiley
  3. Shin BC, et al. Maca (Lepidium meyenii) for improving sexual function: a systematic review. BMC Complement Altern Med. 2010. BMC
  4. Gonzales GF, et al. Effect of Lepidium meyenii on semen parameters in adult men. Asian J Androl. 2001. PubMed
  5. Lee HW, et al. Efficacy of maca on semen quality: a systematic review. World J Mens Health. 2022. PMC
  6. Bogani P, et al. Androgenic and biological activity of maca is not mediated by direct androgen receptor activation. J Ethnopharmacol. 2006. ScienceDirect
  7. Del Carpio-Nuñez U, et al. Lepidium meyenii (maca): pharmacology, clinical evidence, and safety. Front Pharmacol. 2024. PubMed
  8. Gonzales-Arimborgo C, et al. Acceptability, safety, and efficacy of red and black maca in men. Pharmaceuticals. 2016. PMC
  9. LiverTox: Clinical and Research Information on Drug-Induced Liver Injury. Maca. NIH NCBI Bookshelf. 2019. NIH
  10. Dording CM, et al. A double-blind, randomized, pilot dose-finding study of maca root for the management of SSRI-induced sexual dysfunction. CNS Neurosci Ther. 2008. PMC
  11. Vera-López KJ, et al. Nutritional and safety aspects of maca: effects of processing and potential goitrogens. Nutrients. 2024. MDPI
  12. NIH Office of Dietary Supplements. Dietary Supplements: What You Need to Know. NIH
  13. Zhu H, et al. Macamides in Lepidium meyenii: chemistry, bioactivity, and quality control. Food Res Int. 2020. ScienceDirect
  14. Gonzales GF. Ethnobiology and Ethnopharmacology of Lepidium meyenii (Maca). Evid Based Complement Alternat Med. 2012. PMC

Further Reading

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