Does Maca Root Actually Balance Hormones?

Maca root does not balance hormones in the way supplement marketing implies. Multiple clinical trials in both men and women have measured serum levels of testosterone, estradiol, and other reproductive hormones after weeks of maca supplementation and found no significant changes compared to placebo. What makes the story interesting is that maca does appear to improve some symptoms people associate with hormonal imbalance, such as low libido and menopausal discomfort, through mechanisms that seem to bypass the hormonal system entirely.

Maca Contains No Hormones and No Plant Estrogens

One of the most persistent claims about maca is that it works like a phytoestrogen, similar to soy or red clover. Analytical research has repeatedly looked for plant estrogens or hormones in maca preparations and come up empty. Multiple analyses of maca hypocotyl composition have found no analytically determined plant estrogens or hormones in the root.¹ This finding has been confirmed across different preparations and processing methods.²

Instead, maca’s bioactive compounds are things like macamides and macaenes, which are unique secondary metabolites not found in other plants.³ Chemical profiling has identified over 160 compounds in maca extracts, including alkaloids, glucosinolates, and various fatty acid derivatives.⁴ The plant is a member of the Brassicaceae family, making it a relative of broccoli and cabbage, and it has been cultivated in the Peruvian highlands for over 2,000 years.⁵ So when you take a maca supplement, you are not introducing any hormonal substance into your body. Whatever maca does, it is not doing it by adding estrogen or testosterone to your system.

Clinical Trials Show No Change in Hormone Levels

The most direct way to test whether a substance “balances hormones” is to measure hormone levels before and after people take it. Several controlled trials have done exactly this, and the results are remarkably consistent. In healthy adult men given maca for 12 weeks, serum testosterone and estradiol levels showed no difference between the maca and placebo groups.⁶ A separate pilot study measuring multiple hormones after 12 weeks of maca supplementation similarly found no substantial changes in blood serum hormone levels compared to placebo.⁷

The pattern holds in older men as well. A randomized, double-blind trial in men with symptoms of age-related testosterone decline found no statistically significant difference in serum total testosterone or free testosterone between the maca and placebo groups.⁸ And in postmenopausal women, a study that found reductions in anxiety, depression, and sexual dysfunction with maca also ran assays for estrogenic and androgenic activity. No physiologically significant activity was observed, even at high extract concentrations.⁹

This is about as clear as nutritional science gets on a question like this. Across different populations, ages, and study designs, maca does not budge your circulating hormone levels in a measurable way.

The Paradox of Symptom Relief Without Hormonal Change

Here is where things get genuinely interesting. Despite leaving hormone levels untouched, maca has shown some ability to improve symptoms that people typically attribute to hormonal imbalance, especially in the context of menopause. In early postmenopausal women, a double-blind, placebo-controlled crossover trial found that maca significantly lowered scores on menopausal symptom indices, reducing the frequency and severity of hot flushes, night sweats, and psychological symptoms.² Another trial in early postmenopausal women reported increased energy, reduced nervous tension, fewer hot flushes, and greater interest in sex after two months of maca use.¹⁰

A pilot study in postmenopausal women also found significant decreases in diastolic blood pressure and depression after maca treatment.¹¹ A systematic review of the menopausal evidence concluded that all identified randomized trials demonstrated favorable effects of maca on menopausal symptoms, but cautioned that the total number of trials, sample sizes, and methodological quality were too limited to draw firm conclusions.¹²

This is the central paradox of maca research. The symptoms improve, but the hormones that supposedly cause those symptoms do not change. This suggests that maca is doing something else entirely, working through pathways that influence how the body responds to its existing hormonal environment rather than altering the hormones themselves.

Libido Improvements That Have Nothing to Do With Testosterone

The sexual desire findings are perhaps the most carefully studied example of this disconnect. In a well-known trial, men who took maca for eight to twelve weeks reported increased sexual desire. But when the researchers looked at testosterone and estradiol levels, there was no difference between the maca and placebo groups. Statistical analysis confirmed that maca’s effect on libido was independent of hormone changes, and also independent of changes in mood or anxiety.¹³

Maca has also been tested for sexual dysfunction caused by antidepressant medications, a common side effect of SSRIs. In a dose-finding study, subjects taking 3 grams per day of maca showed significant improvement in sexual function scores, while those on a lower dose of 1.5 grams did not, suggesting a dose-dependent effect. Libido specifically improved across participants regardless of dose group.¹⁴ A separate trial in women with antidepressant-induced sexual dysfunction found that remission rates were somewhat higher in the maca group compared to placebo, with the strongest association seen in postmenopausal women.¹⁵

Similar trends appear with fertility markers. In healthy men, sperm concentration and motility showed rising trends after 12 weeks of maca, even though hormone levels remained flat.⁷ The effects on libido, sexual function, and potentially fertility all appear to operate through some route other than changing testosterone or estrogen output.

How Maca Might Actually Work

If maca is not altering hormones, what is it doing? The honest answer is that nobody has nailed down a single definitive mechanism. But the most intriguing lead involves the endocannabinoid system. Macamides, the fatty acid compounds unique to maca, have been shown to inhibit an enzyme called FAAH, which is responsible for breaking down endocannabinoids in the brain. One particular macamide displayed significant dose-dependent FAAH inhibitory activity, suggesting that macamides could influence the central nervous system in ways that affect mood, pain perception, and possibly sexual function.¹⁶

This is an early-stage finding from laboratory research, not a proven mechanism in humans. But it offers a plausible explanation for how maca could improve subjective experiences like libido, mood, and energy without touching hormone levels. The endocannabinoid system is deeply involved in regulating mood, appetite, pain, and reward. Slowing the breakdown of endocannabinoids could amplify their effects in ways that overlap heavily with what people mean when they say a supplement “balances hormones.” The feeling of something being rebalanced could be real even if the hormones themselves have not moved.

Not All Maca Is the Same

Maca comes in several color varieties, and research increasingly suggests these are not interchangeable. The color of the hypocotyl (the bulbous root), the growing location, cultivation practices, and post-harvest processing all significantly affect nutrition content, phytochemical profile, and clinical applications.¹⁷

In animal research, black maca stands out. In rats, black maca was the only color variety that increased daily sperm production and improved sperm motility after both short-term and long-term treatment. Red maca, by contrast, had no effect on sperm counts but did reduce prostate weight. Yellow maca fell somewhere in between.¹⁸ In a study using ovariectomized mice, black maca also showed the best results for learning tasks, while all three colors reduced immobility in a forced swimming test, which is used as a proxy for antidepressant-like effects.¹⁹

For athletes, a study of elite male athletes supplementing with black maca found improvements in aerobic energy systems and markers of inflammation, with the researchers attributing the effect to increased antioxidant activity and changes in mitochondrial biosynthesis factors.²⁰ Rat studies have similarly shown maca supplementation increasing swimming time to exhaustion while reducing markers of oxidative stress and lactate buildup.²¹ Most generic maca supplements do not specify the color variety, so if the animal research translates to humans at all, you may not be getting the type most relevant to what you are trying to achieve.

The Evidence Is Promising but Thin

It would be easy to read the trial results above and conclude that maca is a well-validated functional food. It is not. A systematic review covering both clinical and preclinical evidence on maca’s effects on sexual dysfunction, menopausal symptoms, and related conditions identified 57 studies that met inclusion criteria, but only 14 were clinical trials in humans. The overall quality of evidence was rated as unclear due to insufficient reporting, with a high risk of reporting bias. Doses and durations varied so widely across studies that a formal meta-analysis was not feasible.²²

This is the state of the science: a handful of small trials, mostly positive in direction, with consistent hormone data showing no change, and mechanistic work that is largely preclinical. The findings are coherent and suggestive rather than conclusive. Maca research is where many herbal supplements were 20 years ago: enough signal to justify further study, not enough to make strong medical claims.

Safety Concerns Worth Knowing About

Maca is generally considered safe and well tolerated in the trials conducted so far, but there are a few concerns that rarely make it into marketing materials.

Because maca is grown in the Peruvian central highlands, often in areas affected by mining and metallurgical activity, contamination is a real issue. An analysis of maca grown in three districts of the Junín province found that mean concentrations of cadmium and lead in maca samples exceeded the limits set by the FAO and World Health Organization.²³ This does not mean all maca products are contaminated, but it does mean that sourcing and third-party testing matter more than most consumers realize.

Supplement quality is another problem. An analysis of maca-containing dietary supplements found that the majority of multi-component preparations either did not contain the declared herbal component or contained very low quantities of macamides. One product was found to be adulterated with a synthetic phosphodiesterase inhibitor, which is the active class of compounds in prescription erectile dysfunction drugs.²⁴ Researchers have also been developing spectroscopy-based methods to detect adulteration of maca powder with cheaper fillers like soy and maize flour.²⁵

A Caution for Hormone-Sensitive Conditions

For people with or at risk for hormone-sensitive cancers, maca occupies an uncomfortable gray zone. One laboratory study found that standardized maca root extract increased the migratory capacity of triple-negative breast cancer cells and massively upregulated expression of a gene involved in the metastatic process. The researchers warned that this was the first indication that maca consumption could be dangerous in the context of this particular cancer type.²⁶ This was a cell-culture study, not a human trial, so the leap from petri dish to person is large. But it is a red flag that has not been adequately followed up.

Somewhat reassuringly, a separate study tested whether several hair-growth nutraceuticals, including maca, interfered with tamoxifen’s ability to suppress breast cancer cell growth. In hormone-receptor-positive cell lines, maca did not stimulate cell proliferation or interfere with tamoxifen’s action.²⁷ So the picture is mixed even in lab settings. If you have a hormone-sensitive condition, the evidence is too early and too contradictory to say maca is safe for you. This is one case where the “talk to your doctor” advice is not a formality.

Why “Hormone Balancing” Keeps Getting Repeated

The phrase “hormone balancing” is not a medical term. No regulatory body defines what it means, and it has no measurable clinical endpoint. It persists in marketing because it resonates with real experiences: people take maca, some of them feel better in ways that resemble what they imagine hormonal correction would feel like, and the narrative writes itself. The term also sidesteps regulatory scrutiny; under dietary supplement law, vague structure-function claims like “supports hormonal balance” are permissible without FDA approval, as long as no specific disease claim is made.

What the clinical evidence actually supports is more modest and more interesting. Maca does not push your estrogen up, or your testosterone up, or bring any hormone “back into balance.” It may improve subjective well-being, mood, libido, and menopausal comfort through mechanisms that operate downstream of or parallel to the hormonal system. The endocannabinoid pathway is one candidate. Adaptogenic effects on the hypothalamic-pituitary axis have been proposed but remain speculative. Maca’s glucosinolates, shared with other cruciferous vegetables, could also contribute indirectly through anti-inflammatory and antioxidant pathways.

The distinction matters because it changes what you should expect. If maca worked by raising your estrogen, you could measure that. You could also predict who it would help and who it might harm. Because maca appears to work through murkier routes, the effects are harder to predict, harder to quantify, and more likely to vary from person to person. That is not a reason to dismiss it. It is a reason to be honest about what “works” means in this context, and to recognize that the supplement industry’s favorite phrase does not describe what the research actually shows.