Can I Take Ashwagandha and Maca Root Together?

Taking ashwagandha and maca root together is generally considered safe, and no clinical evidence points to a harmful interaction between the two. They work through different biological pathways, which is partly why combining them has become popular in supplement stacks aimed at stress relief, energy, and sexual health. That said, “no known interaction” is not the same as “proven safe in combination,” because the pair has never been rigorously studied as a duo in a controlled trial. Understanding what each one actually does on its own, and where the real safety concerns lie, gives you a much better basis for deciding whether the combination makes sense for you.

Why People Combine Them

Ashwagandha and maca root are both classified as adaptogens, a loose category of plants traditionally used to help the body handle stress. Both have long histories of use in their respective cultures: ashwagandha in Ayurvedic medicine on the Indian subcontinent, and maca among Andean populations in Peru, where the root has been consumed for energy and stamina at high altitudes for centuries.¹ Despite the shared “adaptogen” label, they contain very different active compounds and appear to act on different systems in the body. This is the core reason the combination appeals to people: you get two tools that each pull a different lever rather than doubling up on the same one.

How Ashwagandha Works

Ashwagandha’s main active compounds are withanolides, and the best-supported mechanism involves dampening the body’s stress response. In a randomized, double-blind, placebo-controlled study of stressed adults, those taking ashwagandha showed reduced morning cortisol and DHEA-S levels, suggesting the supplement tones down activity along the hormonal chain that fires when you encounter stress.² A broader review of ashwagandha’s endocrine effects confirmed that this stress-axis modulation is the supplement’s primary mechanism, and also found increases in reproductive hormones in men, which helps explain its reputation as a fertility aid.³

Beyond stress, ashwagandha has shown up in research on cognition and physical performance. An eight-week trial found that participants taking ashwagandha root extract improved on tests of immediate and general memory, executive function, sustained attention, and processing speed compared to placebo.⁴ A systematic review and meta-analysis also found a meaningful improvement in VO₂max, a measure of aerobic fitness, in both athletes and non-athletes taking the supplement.⁵

How Maca Works

Maca root operates through a different set of compounds. Its signature bioactives include macamides, macaenes, and glucosinolates, and preclinical research has attributed effects like neuroprotection, anti-inflammatory activity, immune regulation, and antioxidant properties to various components of the root.⁶ Unlike ashwagandha, maca does not appear to act primarily through cortisol reduction. Its effects on energy and mood seem to come from a different biochemical angle, though the exact mechanisms are less clearly mapped in human trials than ashwagandha’s cortisol-lowering pathway.

Where maca has the most clinical attention is in sexual function. A small placebo-controlled trial in women experiencing antidepressant-induced sexual dysfunction found that maca was associated with higher rates of improvement compared to placebo, with the strongest benefits seen in postmenopausal participants.⁷ That trial was small, and the overall remission rates were modest, but the finding is consistent with the traditional use and with other preliminary trials on maca and libido. The supplement was well tolerated in that study.

Where Their Benefits Overlap

A scoping review of randomized controlled trials on dietary ingredients and mental energy identified both ashwagandha and maca as among the most promising ingredients for further evaluation when it comes to mood and perceived feelings of well-being.⁸ That review looked at these ingredients individually rather than in combination, but the fact that both showed up as standouts in the same domain helps explain why people stack them. If ashwagandha primarily helps by lowering cortisol-driven stress and maca primarily helps through its own distinct bioactive profile, there is a plausible rationale for expecting complementary rather than redundant effects.

The overlap is most obvious in three areas: stress and mood support, sexual health, and general energy. For stress, ashwagandha has the stronger clinical data. For sexual function, maca has more direct evidence in women, while ashwagandha’s reproductive effects are better documented in men through its hormone-boosting activity. For overall vitality and energy, both have traditional reputations and some supporting data, but neither has the kind of large-scale, high-quality trial that would make a definitive case on its own.

What the Combination Has Not Been Tested For

Here is where a dose of honesty is warranted. No published randomized controlled trial has tested ashwagandha and maca root together as a combined intervention. The assumption that they are safe and complementary is based on the fact that they act through different pathways, that each is individually tolerated in most people, and that no pharmacological interaction has been identified. That reasoning is sensible, but it is not the same as direct evidence. Supplement companies that sell blends containing both are relying on this inference, not on combination-specific data.

This matters less if you are a generally healthy adult taking standard doses for a few months. It matters more if you have a medical condition, take prescription medications, or plan to use the combination long-term. The absence of interaction data is especially relevant for people on thyroid medications, hormone therapies, or immunosuppressive drugs, because ashwagandha in particular has documented effects on thyroid and stress hormones.

Ashwagandha’s Safety Concerns

Ashwagandha is often described as “generally well tolerated,” and in the context of short-term clinical trials, that description is fair. But there are two real safety signals worth knowing about, particularly if you are considering ongoing use.

The first is liver injury. A scoping review covering 25 reported cases of ashwagandha-associated liver damage found that the most common pattern was cholestatic injury, accounting for about 44% of cases, followed by hepatocellular injury in roughly a third.⁹ A separate review described two additional cases in detail: a 36-year-old man who developed nausea, itching, and dark urine after six months on ashwagandha capsules, and a 30-year-old woman who developed itching after just 45 days. Both showed elevated liver enzymes and bilirubin, and both improved after stopping the supplement. Causality assessment rated the relationship with ashwagandha as “probable” in both cases.¹⁰ At least one previously reported case ended in liver transplantation. The suspected mechanism involves certain withanolides damaging liver cells, possibly through DNA damage and depletion of the liver’s antioxidant reserves.¹¹

These cases are rare relative to the millions of people taking ashwagandha, but they are not trivial. If you develop unexplained itching, nausea, abdominal pain, or dark urine while using ashwagandha, stop taking it and get your liver enzymes checked.

The second concern is thyroid stimulation. A case report described a 73-year-old woman who developed an overactive thyroid with a dangerously fast heart rhythm after two years of self-treating hypothyroidism with ashwagandha. Her thyroid hormone levels normalized and her symptoms resolved after she stopped the supplement.¹² This is consistent with ashwagandha’s known ability to raise thyroid hormone levels, which can be beneficial for some people with underactive thyroids but dangerous for others, especially at high doses or over extended periods. If you have a thyroid condition or take thyroid medication, this combination deserves a conversation with your doctor before you add ashwagandha.

Is Maca Safer?

Maca has a notably cleaner safety profile in the published literature. It has been consumed as a food staple in Peru for thousands of years, and clinical trials have consistently reported that it is well tolerated. The trial on antidepressant-induced sexual dysfunction, for instance, noted good tolerability with no significant adverse effects.⁷ There are no comparable case series of maca-induced liver injury or thyroid toxicity in the literature.

That does not mean maca is risk-free. Maca contains glucosinolates, which in large quantities can affect iodine metabolism and theoretically influence thyroid function, though this effect has not been clinically significant in published trials at typical supplement doses. People with thyroid conditions should still be aware of the theoretical concern. The bigger practical risk with maca, as with any botanical supplement, is product quality rather than the plant itself.

The Product Quality Problem

One risk that applies equally to both supplements is contamination. A study testing adaptogenic herbal supplements on the market found that a majority were contaminated with lead and nickel at levels that pose a health risk. The research identified two contamination pathways: industrial processing and excipients introduced lead, particularly in tablet forms, while environmental contamination at the cultivation stage was responsible for consistent nickel levels in ashwagandha samples originating from India.¹³ The study concluded that current regulatory frameworks, which classify supplements as food rather than pharmaceuticals, are inadequate and allow hazardous products onto the market.

This is arguably a bigger practical concern than any pharmacological interaction between ashwagandha and maca. When you take two supplements instead of one, you double your exposure to whatever contaminants each product contains. If you are going to combine them, choosing products from brands that provide third-party testing results and certificates of analysis becomes more important, not less. Look for supplements tested by independent labs for heavy metals, microbial contamination, and label accuracy.

Practical Guidance on Timing and Dosing

Because there is no combination-specific trial to draw dosing guidance from, the practical approach most practitioners recommend is to use each supplement at its individually studied dose rather than reducing either one. For ashwagandha root extract, most positive clinical trials have used somewhere in the range of 300 to 600 mg per day of a standardized extract, typically split into one or two doses. For maca root, clinical doses are generally higher in raw terms, often in the range of 1.5 to 3 grams of maca powder or its extract equivalent per day.

Timing is more about personal preference and side effect management than about known interactions. Some people find that ashwagandha has a mildly calming effect that pairs well with evening dosing, while maca tends to be associated with an energy boost and is often taken in the morning or before exercise. Taking them at different times of day is a reasonable strategy if you want to minimize any stomach discomfort, since both can occasionally cause digestive irritation when taken on an empty stomach.

Who Should Be Cautious

Most healthy adults can try this combination at standard doses without expecting problems, but certain groups should think twice or consult a healthcare provider first:

Thyroid conditions: Ashwagandha can raise thyroid hormone levels, and maca’s glucosinolates could theoretically interfere with iodine uptake. If you take levothyroxine or another thyroid medication, adding either supplement without medical guidance is unwise.
Liver disease or heavy alcohol use: Given ashwagandha’s documented hepatotoxicity risk, people with compromised liver function are at higher risk of adverse effects.
Autoimmune conditions: Ashwagandha may stimulate immune activity, which could be counterproductive if you are taking immunosuppressive medications for conditions like lupus, rheumatoid arthritis, or after organ transplantation.
Pregnancy and breastfeeding: Neither supplement has adequate safety data in pregnant or nursing women. Ashwagandha in particular has been traditionally described as having abortifacient properties at high doses, and most clinical guidance recommends avoiding it during pregnancy.
Upcoming surgery: Ashwagandha may affect blood pressure and sedation, which could complicate anesthesia. Standard advice is to stop herbal supplements at least two weeks before a scheduled procedure.

Maca Varieties and Why They Matter

One detail that often gets lost in the “can I take them together” discussion is that maca itself is not a single uniform product. The root comes in different color ecotypes, commonly described as yellow, red, and black, and its chemical composition varies depending on ecotype, growing conditions, and how it is processed after harvest.⁶ Black maca is most commonly associated with cognitive and endurance effects in animal research, red maca with prostate health, and yellow maca is the most common and broadly studied variety. The differences are not dramatic enough to cause safety issues when combining with ashwagandha, but they do mean that two maca products on the shelf can have meaningfully different phytochemical profiles. If you are combining maca with ashwagandha for a specific purpose, the color and processing method of the maca product can influence whether you get the outcome you are looking for.

Gelatinized maca, which has been heated to remove starch, is generally considered easier to digest than raw maca powder. This is worth noting if digestive comfort is already a concern when stacking two supplements together. The gelatinization process also concentrates certain bioactive compounds, so you may need a smaller serving of gelatinized maca to achieve a comparable dose.

Drug Interactions Beyond Each Other

While the interaction between ashwagandha and maca gets the most questions, the more clinically relevant interaction concern is how each one plays with prescription drugs. Ashwagandha’s cortisol-lowering and thyroid-stimulating effects mean it can alter the effective dose of medications targeting the same systems. Combining ashwagandha with benzodiazepines or other sedatives could amplify sedation. Combining it with thyroid hormone replacement could push levels higher than intended, as the case report of thyrotoxicosis illustrated.¹² Ashwagandha may also lower blood sugar, which is relevant if you take diabetes medications.

Maca has fewer documented drug interactions, consistent with its generally milder pharmacological activity. However, its hormonal reputation means that people on estrogen-sensitive therapies, such as treatments for breast cancer, sometimes wonder whether maca is safe. Current evidence does not show that maca meaningfully alters circulating estrogen levels in humans, but the data on this question is thin enough that caution is reasonable for anyone on hormone-sensitive medication.