Maca Interactions: What the Science Says
Maca (Lepidium meyenii) is a Peruvian root vegetable used traditionally for energy, libido, and fertility support. Its global popularity has grown, but interactions with other substances and medications need clarification.
Drug Interactions
Hormonal medications: Maca contains glucosinolates, which could theoretically affect hormone metabolism. Although maca does not itself contain steroidal hormones, it has described adaptogen-like effects that might potentially interact with hormone replacement therapy or hormonal preparations. Human studies in this area are limited — Gonzales et al. (2002) found that maca did not affect LH, FSH, or testosterone levels in men, but more precise interaction studies are absent.
Thyroid medications: Maca contains glucosinolates that could theoretically affect thyroid function, similar to other brassica family plants (such as cabbage and broccoli). People with thyroid conditions taking thyroid medications are wise to consult a doctor before using maca.
Antihypertensive medications: One small study (Stojanovska et al., 2015) found that maca may affect diastolic blood pressure in post-menopausal women. This is potentially important for those using blood pressure medications.
Nutrient Competition and Synergy
Maca is nutrient-dense, containing iron, iodine, manganese, copper, and B-group vitamins. Its iron content creates potential synergy with other iron-rich supplements, but excessive iron from combined sources can be harmful — monitoring total iron intake is sensible.
Maca's iodine content varies considerably. Those with thyroid conditions already using iodine supplements should factor this in.
Food Effects
Maca is traditionally cooked (boiled), as raw maca in large quantities is not recommended. Most supplements use gelatinised (cooked) maca powder, which is more digestible. Taking maca with food improves tolerability and reduces potential gastrointestinal irritation.
Who Must Be Cautious
- Those using hormonal medications: caution is advisable
- People with thyroid conditions: consult a doctor before using maca
- Pregnant or breastfeeding women: data are insufficient; use is not recommended
- Patients with hormone-sensitive cancers: not recommended without medical supervision
Practical Rules
NOW Maca 500mg 250 veg. caps., Ostrovit Maca 90tab, and ICONFIT Maca 90caps are all available at maxfit.ee. Follow the recommended dose and do not combine with thyroid or hormonal medications without medical advice.
Bottom Line
Maca is generally safe for healthy adults. The main caution points relate to hormonal and thyroid medications. Research is still limited, so those on specific medications should consult a doctor before use.
FAQ
Does maca raise testosterone levels?
In a 12-week study (Gonzales et al., 2002), maca did not produce a statistically significant effect on serum testosterone in men, although self-reported sexual function scores improved.
Is maca hormonal?
Maca does not itself contain plant hormones such as phytoestrogens found in soy. Its mechanism is unclear but likely operates in an adaptogen-like manner rather than via direct hormonal activity.
Are there side effects from maca?
Most people tolerate maca well. Large doses on an empty stomach may cause gastrointestinal discomfort. Thyroid function changes have been rarely reported.
References
Gonzales, G. F., Cordova, A., Vega, K., Chung, A., Villena, A., Gonez, C., & Castillo, S. (2002). Effect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men. Andrologia, 34(6), 367-372. https://pubmed.ncbi.nlm.nih.gov/12472620/
Stojanovska, L., Law, C., Lai, B., Chung, T., Nelson, K., Day, S., Apostolopoulos, V., & Haines, C. (2015). Maca reduces blood pressure and depression, in a pilot study in postmenopausal women. Climacteric, 18(1), 69-78. https://pubmed.ncbi.nlm.nih.gov/24931003/
Zenico, T., Cicero, A. F., Valmorri, L., Mercuriali, M., & Bercovich, E. (2009). Subjective effects of Lepidium meyenii (Maca) extract on well-being and sexual performances in patients with mild erectile dysfunction: a randomised, double-blind clinical trial. Andrologia, 41(2), 95-99. https://pubmed.ncbi.nlm.nih.gov/19260845/
