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Peruvian Maca: Benefits, Contraindications and How to Take It
It grows at 4,000 metres altitude in the Peruvian Andes, in extreme climatic conditions that very few plants tolerate. For the Incas it was sacred food, reserved for warriors before battle and couples wishing to conceive. Today Peruvian maca is among the best-selling adaptogens in the world — but also one of the most misunderstood: some consider it a "natural viagra" (it isn't), others accuse it of raising testosterone (it doesn't), some fear thyroid contraindications (it depends).
In this comprehensive guide we present what science really says about Peruvian maca: origins, chemistry of active principles, benefits documented by RCTs (with PubMed studies in hand), effective dosages, differences between yellow/black/red maca, how and when to take it, and true contraindications. We rely on the reference works of the Gonzales group (Peru) and the Shin 2010 systematic review, maintaining a rigorous filter on what's supported by clinical evidence versus marketing.
What is Peruvian maca (Lepidium meyenii)
Peruvian maca, whose scientific name is Lepidium meyenii, is a plant of the Brassicaceae family — the same as broccoli, cabbage and radish. It's native to the central Andean plateau of Peru, where it has been cultivated for at least 2,000 years in the departments of Junín and Cerro de Pasco, at altitudes exceeding 4,000 metres. It's one of the few food plants able to survive the extreme temperature ranges, lack of oxygen and intense UV radiation of those altitudes.
The part used is the tuberous root, resembling a small radish. It's harvested after 7-9 months of growth, sun-dried for weeks and then reduced to powder, the traditional form of consumption. Maca has an earthy, slightly bitter and malted flavour — many add it to smoothies, porridge or coffee, but the form with documented clinical effects is the standardised extract in capsules.
Root chemistry: macamides, macaenes and glucosinolates
Maca contains many unique bioactive compounds. The most important are:
- Macamides and macaenes: amidated and oxidised fatty acids, exclusive to this plant. Considered the main biomarkers of an extract's quality
- Glucosinolates (especially glucotropaeolin): sulphurous compounds typical of Brassicaceae
- Alkaloids (macaridine, lepidiline)
- Plant sterols, polyphenols, B-vitamins, iron, zinc, calcium
- Essential amino acids: maca contains a good protein share (10-14%)
Contrary to what's often read, maca contains neither phytoestrogens nor phytoandrogens: it doesn't act directly on hormone receptors. Its effects are mediated mainly by the hypothalamic-pituitary-gonadal axis and adaptogenic mechanisms not yet fully clarified.
What is maca useful for: scientifically documented benefits
Contrary to exaggerated marketing, maca has concrete benefits supported by clinical trials — not all those you read, but those that exist are robust.
Libido and sexual function
This is the effect with the strongest evidence. The Shin 2010 systematic review (PMID 20691074), published in BMC Complementary and Alternative Medicine, analysed 4 RCTs concluding that maca has beneficial effects on sexual dysfunction in three populations: healthy men, men with mild erectile dysfunction and menopausal women with SSRI-induced low libido. The Gonzales 2002 study (PMID 12472620) on 57 healthy men showed that 1,500-3,000 mg/day for 12 weeks increases sexual desire without modifying testosterone, LH, FSH or prolactin. This is the crucial point: maca works on libido through a non-hormonal mechanism.
Energy and fatigue reduction
Maca is traditionally used as a tonic against physical and mental fatigue. Studies show improvements in perceived energy, reduction of chronic fatigue and better tolerance to exertion. The mechanism is probably adaptogenic: maca modulates cortisol response and supports the hypothalamic-adrenal axis.
Hormonal balance and menopause in women
Several RCTs (particularly Meissner 2005-2006 on gelatinised maca) have shown that maca reduces menopausal symptoms (hot flushes, insomnia, night sweating) and improves mood and libido in peri- and postmenopausal women. The peculiarity: maca is not a phytoestrogen, so it represents an option even for women who can't/won't take phytoestrogens (soy, red clover) — for example due to hormone-dependent breast cancer history. The mechanism acts on the pituitary axis, not on oestrogen receptors.
Memory and cognition
Studies in animal models and preliminary human studies suggest a neuroprotective effect of maca, with improvement in working memory and learning. The Gonzales 2012 review (PMID 21977053) summarises available studies. The mechanism probably involves acetylcholinesterase inhibition and antioxidant protection.
Male fertility
RCT studies have shown that maca increases ejaculate volume, sperm count and motility in healthy men. Effects are probably independent of testosterone, which as mentioned is not modified. Used as adjuvant in natural fertility support protocols.
How to take maca: dosages, times, formats
Effective dose according to clinical trials
The effective dose documented in clinical trials is 1,500-3,000 mg/day of root powder (equivalent to about 1.5-3 g). With concentrated extracts the amount is much lower: a 100:1 extract (where 1 g of extract corresponds to 100 g of root) allows doses of 100-300 mg/day with comparable effects. Studies with doses under 1 g/day of powder have unconvincing results.
Gelatinised maca, powder or 100:1 extract: what's the difference
- Root powder: traditional format, but contains raw starch that some people digest poorly. Requires significant daily doses (2-3 g)
- Gelatinised maca: powder passes through hot water at low pressure, eliminating starch. Improves digestibility and concentrates active ingredients. Many clinical trials use this form
- 100:1 extract: root is extracted with solvents (water or alcohol) to concentrate macamides 100 times. Allows very reduced doses (100-300 mg/day) with equivalent or superior effects to 2-3 g of powder
Recommended cycle
Maca works in the medium-long term. First effects (energy, mood) are noticed typically in 2-4 weeks; the effect on libido requires 8-12 weeks to manifest consistently. The standard protocol is 12 weeks of continuous intake, followed by 4 weeks off. There's no evidence of tolerance or habituation, but the cycle with break allows assessment of the real benefit.
Time of day: many studies use it in the morning or split morning/lunch to not interfere with sleep (some find it mildly energising). Empty or full stomach: both options are valid, depending on personal gastric tolerance.
Contraindications: who should NOT take maca
Pregnancy and breastfeeding
There are no safety studies in pregnancy and breastfeeding. As a precaution it is not recommended in these phases, as for most plant supplements.
Uncontrolled thyroid disorders
Maca contains glucosinolates (sulphurous compounds typical of Brassicaceae) which, at high doses and with iodine deficiency, can interfere with thyroid function. In practice the risk is very low at therapeutic doses (1.5-3 g/day) in people with adequate iodine intake, but those with Hashimoto's hypothyroidism or on levothyroxine should consult the doctor and evaluate possible TSH monitoring. Gelatinised maca has reduced glucosinolate content and lowers risk.
Drug interactions
Maca has no major known interactions, but caution with therapy involving:
- Anticoagulants (warfarin, DOAC): INR monitoring
- SSRI/SNRI: maca can improve sexual dysfunction from antidepressants but don't stop therapy
- Hormonal drugs: contraceptives, tamoxifen, replacement therapy — talk to the doctor
Hormone-sensitive tumours
Although maca contains no phytoestrogens, in case of hormone-dependent neoplasms (breast, endometrium, prostate) consultation with the oncologist is appropriate before taking.
Black, yellow and red maca: which to choose
Maca comes in three chromatic varieties depending on root pigment:
- Yellow maca: the most common (60-70% of production). General effects on energy, mood, libido of both sexes
- Black maca: 15-25% of production. Gonzales 2009 studies (PMID 20090350) showed superior effects on male libido, fertility, memory and stress. It's the most studied variety for men
- Red maca: 20-25% of production. Particular effects on benign prostatic hyperplasia and bone density in menopausal women
INCA FORCE: the RedMoringa formula with black maca 100:1 extract
INCA FORCE is the RedMoringa formula bringing maca benefits in a clinically relevant concentration:
- Peruvian black maca extract 100:1: the most studied variety for men
- Tribulus terrestris standardised to 90% saponins
- Organic Moringa oleifera: micronutritional base
The synergy between maca and other actives allows effects on libido, energy and vitality with a single daily capsule. Ideal for cycles of 8-12 weeks. For a more sports-oriented version, the Energy Supplement with Tribulus and Maca is designed for athletic strengthening.
FAQ — Peruvian maca
Does maca increase testosterone?
No. This is perhaps the most widespread and most incorrect myth. The Gonzales 2002 study and subsequent reviews have shown that maca does not modify testosterone, LH, FSH, prolactin or oestradiol. The effects on libido and sexual function are mediated by non-hormonal mechanisms.
How long to see effects?
First effects on energy and mood are typically noticed in 2-4 weeks. The effect on libido requires 8-12 weeks to be constant.
Better morning or evening?
Maca has slight energising effect in some people, so morning or lunch is the safest choice. Avoid right before bed if sensitive to stimulants.
Does maca cause weight gain?
No. Maca has low calorie content at therapeutic doses. There's no evidence of weight gain linked to intake.
Take on empty or full stomach?
Both options work. Empty stomach gives faster absorption but some people have mild nausea. In that case intake with food solves it.
Difference between maca and ginseng?
Two adaptogens with different mechanisms. Ginseng is more stimulating, acts on HPA axis with acute effect on energy and attention. Maca has a more modulating effect, less stimulating, with main benefits on libido, sexual function and hormonal balance.
INCA FORCE — Black Maca Extract 100:1 + Tribulus + Moringa
The most studied maca variety in titrated concentration: libido, energy and vitality with clinical evidence.
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