Maca Dose: Why 100 mg in a Blend Won't Do What 3 Grams Did in the Trials

Maca has something most of this shelf does not: randomised trials reporting more desire, with no change in testosterone at all. It also has the widest dose gap here. The trials used 1.5 to 3 grams a day; the formulas we track carry 100 to 250 mg. If maca is what you want, a blend is not how to get it.

The finding, and why it’s strange

Randomised trials in men have reported increased sexual desire after eight to twelve weeks of maca, compared with placebo. In the same trials, researchers measured testosterone, luteinising hormone and oestradiol — and found no significant change.

Desire went up. The hormones that supposedly govern desire didn’t move.

That’s an uncomfortable result for the usual story, and it’s the reason maca is worth understanding rather than filing under “testosterone booster”, which is where most sales pages put it. Whatever maca is doing, it isn’t doing it by raising testosterone, and a product that sells it as a hormone lever is describing a mechanism the research specifically failed to find.

The leading guesses involve the central nervous system and mood rather than the endocrine system. Maca has also been reported to help with antidepressant-associated sexual dysfunction, which fits a brain-side explanation better than a hormone-side one.

Desire is not the same complaint as mechanics

Worth separating, because the two get sold as one thing. Maca’s evidence is about wanting to. Nothing in it speaks to firmness, duration or blood flow. If your complaint is that the equipment doesn’t respond the way it did, maca is aimed somewhere else — look at the nitric-oxide herbs instead.

If the complaint is that you don’t think about it any more, maca is one of the few options with a controlled trial pointing its way.

The dose gap

The trials used 1.5 to 3 grams a day, usually of dried root powder. The formulas we track carry 100 mg to 250 mg. The most generous of them is about a sixth of the low end of the studied range.

Maca is a food — it’s eaten as a root vegetable in Peru, in quantities far beyond any capsule — so the gram-scale doses in trials aren’t exotic. They’re closer to how the plant is actually used. A 100 mg sprinkle inside a blend is nothing like that.

Among the herbal formulas, Horse Jello carries maca at 100 mg alongside epimedium and tongkat — the three-herb pattern that keeps recurring in this category.

Of the formulas we track, the highest maca dose we've recorded is 250 mg in Prostavive, which is a prostate formula rather than a performance one — a reminder that the same plant gets recruited for different stories depending on what the rest of the panel is selling.

Colour matters, apparently

Maca comes in yellow, red and black varieties, and the small literature suggests they aren’t interchangeable — black maca is the one most often associated with the desire and sperm findings. Almost no label tells you which you’re getting. If one does, that’s a sign someone paid attention.

Who it suits

Someone whose complaint is desire rather than function. Someone on an antidepressant with the sexual side effects that often come with it, who wants something with at least a little evidence behind it. Anyone who’d rather take a food than a stimulant.

Who should leave it alone

Maca is a cruciferous vegetable, related to broccoli and mustard, and contains compounds that can interfere with thyroid function in large amounts — relevant if you have a thyroid condition. Otherwise it has a good safety record, which is what you’d expect from something people eat as a vegetable.

The short version

Real trials, real effect on desire, no hormone change — and a dose on most labels far below what the trials used. Which makes maca a poor reason to choose a blend and a very good reason to check what the blend is actually built around. If desire is your complaint, the formulas worth your money lead with a serious dose of something — tongkat at 200-300 mg is the usual answer — rather than a pinch of six things.