Does Maca Root Actually Work? Energy, Libido, Memory and What Form to Buy

8 min readBy NikhilLast updated October 20, 2026

Where Maca's Evidence Actually Stands

Maca gets sold as a testosterone booster, an energy fix, an aphrodisiac and a fertility aid, sometimes all four on the same label. Pull apart the actual research and it backs some of that and quietly walks past the rest.

Libido is the strongest evidence here by a wide margin, a real, measurable increase, with a smaller bump in overall sexual function, and it shows up in both men and postmenopausal women, which is unusual for this category of ingredient.

What it doesn't do is raise testosterone. Researchers have specifically gone looking for a hormonal mechanism, testosterone, estrogen, luteinizing hormone, and come up empty. Whatever maca is doing, it isn't the mechanism most bottles imply.

Memory is the weakest claim on this page, full stop. The supporting evidence is almost entirely animal studies so far, genuinely interesting, not remotely proof of a human effect.

Form matters more than most buying guides let on: raw powder, gelatinized powder, and a standardized extract are three different products, not three labels for the same thing.

The thyroid caution that circulates online is real but overstated, maca does contain some natural goitrogens as a cabbage-family plant, but standard processing knocks most of that back, and maca itself contributes a bit of iodine.

Dose-wise, 1,500 to 3,000mg a day with food is what the research and most labels use, and there's no good evidence that pushing higher gets you there any faster.

What Maca Actually Does to Energy, Libido and Mood

Maca has one of the more interesting reputations in the supplement world: sold everywhere as a natural testosterone booster, an energy fix, an aphrodisiac, a fertility aid, sometimes all four on the same label. The research supports some of that and quietly contradicts the rest.

Libido: this is maca's strongest evidence by a clear margin. Research on Lepidium meyenii describes a notable increase in libido, alongside a smaller, real improvement in broader sexual function. This shows up in both men and postmenopausal women in the available trials, which is unusual, most libido-focused ingredients only have data in one population.

The testosterone myth: this is the part most product marketing quietly skips. When researchers specifically tested whether maca's effects run through reproductive hormones, testosterone, estrogen, and luteinizing hormone in particular, they didn't find a connection. Maca's libido and mood effects in postmenopausal women showed up independent of any change in estrogen or androgen levels. In plain terms: if a maca product is marketed primarily as a testosterone booster, that claim isn't what the research actually shows. Whatever mechanism is doing the work, it isn't the hormonal one everyone assumes.

Mood: there's early evidence for improvement in menopause-related psychological symptoms, anxiety and low mood specifically, but researchers are consistently careful to flag this as needing more investigation before it's treated as settled.

Energy: this is the most commonly claimed effect and the least specifically studied. Much of what gets cited as "maca for energy" is really the libido and mood research, extrapolated. That doesn't mean people don't feel more energized taking it, but there isn't a dedicated, well-controlled energy trial behind the claim the way there is for libido.

Does Maca Actually Improve Memory?

This is one of the most-asked maca questions online, and it deserves a straight answer: the evidence isn't there yet, at least not in humans.

What exists is a body of animal research, most notably studies showing maca extract preserved cognitive function and supported mitochondrial activity in the brains of middle-aged mice, and separately, that maca extracts improved memory in mice with drug-induced memory impairment. That's real, published, peer-reviewed research, and it's genuinely interesting as an early signal. It is not the same thing as a human clinical trial showing maca improves memory in people, which doesn't yet exist in any robust form.

The honest position: if you're taking maca for libido, mood, or general wellbeing and it happens to come with a cognitive benefit, that would track with the early animal data. But choosing maca specifically as a memory supplement, ahead of ingredients with actual human cognitive trial data behind them, isn't what the current evidence supports.

Raw, Gelatinized, or Extract: What's Actually Different

Most maca buying guides present this as a two-way choice. It's really a three-way one, and the third option rarely gets mentioned because it's less common on ingredient-blog shelves and more common in capsule products.

Raw maca powder is the root, dried and milled, nothing else done to it. It retains more of maca's naturally heat-sensitive compounds, but it also keeps the root's natural starch content intact, which is the main reason some people find raw maca harder on digestion, bloating and mild discomfort are the most commonly reported issues.

Gelatinized maca powder has been heat- and pressure-treated to break down that starch. It's generally easier on digestion and, as a secondary effect, this processing also reduces most of the goitrogenic compounds maca naturally contains as a member of the same plant family as broccoli and cabbage, relevant to the thyroid question in the next section. The tradeoff is that some heat-sensitive compounds are reduced in the process, though the powder also becomes more concentrated by weight since inactive starch makes up less of the final product.

Standardized extract is a third path: rather than drying and milling the whole root, the root is processed at a defined herb-to-extract ratio and assayed for a specific marker compound, in maca's case, macamides, the group of compounds most associated with its studied effects. This is the form used in capsule products like Stay Rooted, where every batch is tested against a minimum macamide content rather than relying on the natural, batch-to-batch variation you get from a raw or gelatinized powder. The practical upside isn't that it's "stronger," it's that dosing is consistent capsule to capsule, which matters if you're trying to actually judge whether maca is doing anything for you over a few weeks, inconsistent dosing makes that judgment harder, not easier.

There's no universally "best" option here. Raw suits people with unbothered digestion who want the least-processed form. Gelatinized suits people who've tried raw and found it uncomfortable. A standardized extract suits anyone who wants to know the dose is the same every time, without having to think about it.

Dosage and Safety

The standard supplemental dose used across most maca research and product labeling is 1,500-3,000mg a day, taken with food. There isn't good evidence that a higher dose works faster or better, and no robust toxicity has been reported in human use, though researchers are consistently upfront that the overall safety research base is still thinner than for better-studied herbs.

On the thyroid question specifically: maca belongs to the same plant family (Brassicaceae) as broccoli, cabbage, and other vegetables that naturally contain goitrogens, compounds that can interfere with iodine uptake into the thyroid. Standard processing, gelatinization in particular, reduces most of this. Maca also naturally contributes a small amount of iodine itself, which works against the goitrogen effect rather than adding to it. For most people this is a non-issue. If you have an existing thyroid condition, the sensible approach isn't to avoid maca outright, it's to mention it to your doctor, keep your iodine intake adequate, and get thyroid levels checked a couple of months after starting if you're being monitored anyway. This is general information, not a substitute for advice from your own doctor about your specific thyroid status.

Pregnancy and breastfeeding: there isn't enough safety data to recommend maca in either case, the standard conservative advice applies.

Medication interactions: maca's safety data with specific medications is limited rather than well-mapped, so mentioning it to a doctor or pharmacist if you're on regular prescription medication is a reasonable precaution rather than an overreaction.

Questions People Actually Ask

Does maca root actually work? The strongest evidence is for libido, where research shows a notable increase, with a smaller improvement in overall sexual function. Evidence for energy and memory is much thinner and largely extrapolated from the libido and mood research, or from animal studies.

Does maca boost testosterone? No. Studies looking specifically for a hormonal mechanism found maca's effects on libido and mood were not linked to changes in testosterone, estrogen, or luteinizing hormone levels.

Does maca root improve memory? Not in human trials yet. The supporting evidence so far comes from animal studies showing preserved cognitive function and memory, which is promising but not proof of a human effect.

What's the difference between raw and gelatinized maca? Gelatinized maca is heat- and pressure-treated to break down its natural starch, making it easier to digest and reducing goitrogen content. Raw maca is unprocessed and retains more heat-sensitive compounds but can cause bloating in some people.

Is maca bad for your thyroid? Maca contains some naturally occurring goitrogens as a member of the Brassicaceae family, but standard processing reduces most of this, and maca also contributes a small amount of iodine. People with an existing thyroid condition should mention it to their doctor rather than avoid it outright.

How much maca should I take? The standard dose used in most research and labeling is 1,500-3,000mg a day, taken with food.