A nutrient-dense Andean root taken mainly to support sexual desire, ease the menopausal transition, and improve energy and mood, appearing to work without changing sex hormone levels. The evidence is suggestive rather than settled, benefits are modest and mostly subjective, and lead contamination of some products is the most consequential safety issue. (Full Review)

Protocol

Standard Dose

1,500–3,000 mg/day

Maca root powder; roughly three to six 500 mg capsules

Best Time of Day

Morning or early afternoon

Later dosing may disrupt sleep; often split morning and midday

Form

Gelatinized powder

Heat-treated, more digestible; most positive trials used root powder rather than extracts

Time to effect

Sexual Desire

8–12 weeks

Emerged gradually, implying cumulative rather than rapid action

Menopausal Symptoms

6–12 weeks

Benefits in trials typically emerged over daily use, not immediately

Fair Trial

2–3 months

Requires consistent daily use; continue only if a clear effect is noticed

Benefits

Medium: Sexual desire and libido; menopausal symptom relief

Low: Mild erectile function support; mood and reduced anxiety/depression; physical performance and fatigue resistance

Speculative: Antioxidant and cellular protection; sperm quality and fertility; cognitive and neuroprotective effects

Contraindications

Active hormone-sensitive conditions (e.g., active estrogen-receptor-positive breast cancer)

Uncontrolled thyroid disease

Significant liver disease

Pregnancy and breastfeeding

Products without verified heavy-metal testing

Key Interactions

Antihypertensives

Thyroid replacement medication (levothyroxine)

OTC products affecting alertness or blood pressure (e.g., decongestants such as pseudoephedrine)

Libido- or energy-oriented botanicals (e.g., Tongkat Ali, ginseng, tribulus)

Other goitrogenic brassicas or high-dose soy isoflavones

Risk & Side Effects

Medium: Heavy-metal contamination (lead and cadmium)

Low: Gastrointestinal upset; sleep disruption and jitteriness; effects on blood pressure and liver function

Speculative: Thyroid effects (goitrogenic potential); hormone-sensitive condition interactions

Monitoring

Marker	Target	Why
Blood pressure	<120/80 mmHg	Maca may affect blood pressure
TSH	0.5–2.5 mIU/L	Screens for thyroid impact from goitrogenic glucosinolates
Free T4 and Free T3	Mid-to-upper reference range	Confirms thyroid hormone output if TSH shifts
Blood lead level	<3.5 µg/dL (lower is better)	Detects heavy-metal accumulation from contaminated product
ALT / AST (liver enzymes)	ALT <25 U/L (men), <20 U/L (women)	Screens for the possible liver effects noted in safety reports

Cadence: Baseline, then at roughly 8–12 weeks to assess response, then every 6–12 months for long-term users

Qualitative Assessment

Sexual desire and satisfaction
Menopausal symptom frequency and severity (hot flashes, night sweats)
Energy, stamina, and daytime fatigue
Mood, anxiety, and overall sense of well-being
Sleep quality (to detect any disruption from dosing timing)

Maca for Health & Longevity

Protocol

Benefits

Risk & Side Effects

Monitoring

Qualitative Assessment