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Maca
A traditional Peruvian cruciferous root with food-grade safety and a real but modest libido/sexual-function evidence base across multiple RCTs in men and women — including menopausal symptoms (Meis…
Aliases (8)
Overview
What is Maca?
A traditional Peruvian cruciferous root with food-grade safety and a real but modest libido/sexual-function evidence base across multiple RCTs in men and women — including menopausal symptoms (Meissner 2006), mild ED (Zenico 2009), and SSRI-induced sexual dysfunction (Dording 2008). Crucially: maca does NOT raise serum testosterone (Gonzales 2003 demonstrated this clearly), despite the folkloric "Peruvian Viagra / T-booster" marketing. Mechanism is CNS-mediated, likely via macamide-driven FAAH inhibition (endocannabinoid potentiation). Best for: menopausal women, aging males with subjective libido decline, SSRI sexual side-effect rescue, sperm-quality goals. Marginal value for a 20yo MMA athlete with intact libido and normal T. Black maca preferred for male libido/sperm; red maca for prostate health and menopause; yellow is the cheapest commodity grade. Gelatinized (heat-processed) is preferred over raw for digestibility and reduced goitrogen load. Doses 1.5–3 g/day, 8–12 weeks to read effect.
Research Indications
Macamides
N-benzyl fatty acid amides (N-benzyl-linoleamide, N-benzyl-oleamide, N-benzyl-palmitamide). The maca-specific class, found in no other kn…
Macaenes
unsaturated polyunsaturated fatty acids derived from oleic and linoleic precursors. Often co-quantified with macamides as marker compounds.
Glucosinolates
benzyl glucosinolates (glucotropaeolin, m-methoxybenzyl glucosinolate). Cruciferous compounds that hydrolyze to isothiocyanates with anti…
Macaridine, macahydantoins, polyphenols, sterols, sugars
minor alkaloids and supporting nutritional profile.
Research Protocols
Disclaimer: These are commonly discussed research protocols and not medical advice.
Peptide Interactions
community top-3 combo (168 co-mentions). Different mechanism (HPA-axis adaptogen, GABAergic, mild T-supporting in deficient men). Combined effect: stress + l…
top community combo (177 co-mentions). Zinc directly supports T and sperm quality, complementing maca's CNS-mediated libido effect. Especially useful if zinc…
top-7 combo (133 co-mentions). Eurycoma activates the testicular T pathway directly via Leydig cell stimulation + SHBG modulation. Combining maca (CNS-libido…
L-DOPA precursor. Theoretical synergy with maca's mild monoaminergic effect on libido and motivation.
community anecdote (Discord block). Cocoa contains N-acylethanolamines and PEA, which compete for FAAH degradation. Combined with macamide FAAH inhibition, t…
adaptogen stack — overlapping but non-redundant mechanisms.
top-5 community combos (170, 162). Background nutritional support; not pharmacodynamically synergistic but reflect a stack archetype focused on male hormonal…
additive goitrogen load. Either gelatinize the maca, eat cooked crucifers, or supplement iodine.
theoretical absorption interference (cruciferous goitrogens binding levothyroxine). Take 2+ hours apart if both required.
theoretical (limited data on cruciferous effects on lithium clearance). Probably moot at typical doses.
What to Expect
- Week 1Tolerability and dose-response.
- Week 2-4Early effect window.
- Week 4-8Peak benefit assessment.
- Week 8+Cycle decision point.
Side Effects & Safety 7
Side Effects
- 1GI upset (gas, bloating, cramping) — ~5-6% of community reports. More common with raw maca. Mitigation: use gelatinized form, start at 0.5-1 g/day and titrate.
- 2Mild insomnia — ~4% of community reports. Dose-related. Take in the morning rather than evening.
- 3Anxiety / restlessness — ~6.5% of community reports. Lower dose if observed; consider discontinuation if persistent.
- 4Headache (mild, transient)
- 5Acne / hormonal-feeling skin changes (interesting given the lack of T-elevation; possibly local androgen receptor activity not reflected in serum hormone levels)
- 6Mild "stimulant-like" feeling at higher doses (3 g+) — uncommon but reported
- 7Increased appetite
When to Stop
- Goitrogen / hypothyroid concern (theoretical). Raw maca contains benzyl glucosinolates that hydrolyze to isothiocyanates with theoretical thyroid-blocking activity (similar to broccoli, kale, cabbage). In iodine-replete diets at typical doses (1-3 g/day, gelatinized), clinical thyroid effects have not been documented. Caution warranted in: known hypothyroidism (especially Hashimoto's), iodine-deficient diets, populations on high-cruciferous baseline. Practical rule: gelatinized maca + iodine-replete diet + monitor TSH if any thyroid history. Avoid raw maca + iodine-poor diet combinations.
- Assay interference in T testing (case report). A 2012 case report (PMID 22700073) documented testosterone immunoassay interference in a female taking maca — leading to artifactually elevated reported T. Practical implication: if testing T while on maca, use LC-MS/MS not immunoassay.
- Discord community report of "paranoid psychotic episodes" (9 reports in community data). Likely confounded by polypharmacy (combined with stimulants, cannabis, other compounds). No mechanistic basis for maca causing psychosis at typical doses. Treat as a flag for users with psychotic-spectrum vulnerability.
- First 2 weeks: GI tolerance check. If significant bloating/cramping, switch to gelatinized form or lower dose.
- First 4 weeks: Subjective tolerance — anxiety, insomnia, mood. Discontinue if these dominate the subjective profile.
- Weeks 8-12: Effect read. If no perceptible libido/energy/mood signal by week 12 at 3 g/day gelatinized, the compound likely won't work for this individual.
- Quarterly if continuing long-term: TSH check if any thyroid concern or if running 3 g+/day.
- Pregnancy / breastfeeding — generally considered low risk based on traditional Andean use (where maca is a food), but not formally studied; conservative recommendation is to avoid during pregnancy beyond food-level dosing.
- Active thyroid cancer — relative contraindication for raw cruciferous high-volume; gelatinized at low dose likely fine but discuss with endocrinologist.
- Hormone-sensitive cancers — though maca does not affect serum hormones in healthy populations, prudence suggests avoiding in breast/prostate cancer treatment contexts without oncology approval.
References
Gonzales 2002 (Andrologia, PMID 12472620)
foundational libido RCT; T-independent effect
View StudyGonzales 2003 (J Endocrinol, PMID 12525260)
definitive T-null demonstration in adult healthy men
View StudyGonzales 2001 (Asian J Androl, PMID 11753476)
fertility/semen parameters; n=9, 4-month
View StudyZenico 2009 (Andrologia, PMID 19260845)
n=50 mild ED, 2,400 mg/day × 12 weeks, IIEF-5 P<0.001
View StudyDording 2008 (CNS Neurosci Ther, PMID 18801111)
SSRI sexual dysfunction; dose-response: 3 g/day works, 1.5 g/day doesn't
View StudyShin 2010 (BMC CAM, PMID 20691074)
4-RCT systematic review; "limited evidence"
View StudyLee 2022 (Front Pharmacol, PMID 36110519)
5-RCT semen meta-analysis; mixed-positive
View StudyMeissner 2006 II (IJBS, PMID 23675005)
n=168 menopausal, 2 g/day Maca-GO, symptom relief
View StudyMeissner 2006 III (IJBS, PMID 23675006)
n=34 crossover follow-up; hormone shifts
View StudyStone 2009 (J Ethnopharmacol, PMID 19781622)
n=8 cyclists, 40 km TT; libido P=0.03 vs placebo, endurance not vs placebo
View StudyBower-Cargill 2022 (Phytomedicine Plus)
57-study systematic review; 55/57 reported effect
View StudyBrooks 2008 (Menopause, PMID 18784609)
3.5 g/day postmenopausal, reduced anxiety/depression/sexual dysfunction; no estrogen/androgen change
View StudySrinivasan 2012 (PMID 22700073)
T immunoassay-interference case; use LC-MS/MS
View StudyBogani 2006 (PMID 16239088)
in vitro: no androgen receptor activity
View StudyYoshida 2015 (PMID 26174043)
animal Leydig cell study; aging male rats; not translated to humans
View StudyLatest research
- meta-analysisMaca (Lepidium meyenii Walp.) on semen quality parameters: A systematic review and meta-analysisFive RCTs pooled — mixed efficacy on sperm concentration and motility in infertile/normal men. Effects modest but trending positive at 1.5-3 g/day for 8-12 weeks.
- reviewA systematic review of the versatile effects of the Peruvian Maca Root (Lepidium meyenii) on sexual dysfunction, menopausal symptoms and related conditions57 studies reviewed (14 clinical, 43 preclinical) — 55/57 reported a measurable effect; phenotype (color), processing (gelatinized vs raw), and origin (Junin altitude-grown vs sea-level imitation) materially affect outcomes.
- systematic-reviewMaca (L. meyenii) for improving sexual function: a systematic reviewFour RCTs analyzed — 2 positive in menopausal women and healthy men, 1 null in cyclists, 1 positive in ED patients. 'Limited evidence' overall — small sample sizes, methodological weaknesses.
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