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Maca Root Side Effects and Tribulus Side Effects
Reported maca root side effects are mostly subjective: cycle changes, moodiness, cramps, gastritis and insomnia (MSK, Maca). Tribulus side effects include stomach irritation, reflux and rare case reports of kidney injury and priapism (MSK, Tribulus terrestris). Both sit in the Stallion Power blend, with label ceilings of 41 mg for maca and 10.25 mg for tribulus.
Written by the Stallion Power label deskUpdated · 4 min read
Maca and tribulus side effects side by side
Both herbs have thin safety records. Maca reports are mostly mild. Tribulus has a few rare but serious case reports.
| Topic | Maca | Tribulus |
|---|---|---|
| Common reports | Altered menstrual cycles, moodiness, cramps, gastritis, insomnia (MSK, Maca) | Transient stomach irritation and reflux (MSK, Tribulus terrestris) |
| Rare or serious | One case report of prolonged bleeding and raised testosterone in a woman using 1 teaspoon of powder daily (MSK, Maca) | Kidney toxicity, severe hyperbilirubinemia with acute renal failure, priapism (MSK, Tribulus terrestris) |
| Medicine concerns | May interfere with testosterone lab tests (MSK, Maca) | Diuretics, blood pressure, diabetes medicines, clopidogrel and others, relevance unknown (MSK, Tribulus terrestris) |
| Safe dose stated | Not in the source we read | No (MSK, Tribulus terrestris) |
Maca root side effects in more detail
Memorial Sloan Kettering says reported reactions are subjective and based on few trials (MSK, Maca). The one case report involved a woman, so it may not apply to men, but it shows that maca can interact with hormone measures.
- Tell your provider before any test that measures testosterone, because maca may interfere with the immunoassay (MSK, Maca).
- Hormone-sensitive cancer, pregnancy or breastfeeding: discuss use with a provider first (MSK, Maca).
- A losartan interaction was seen in rats only, and its relevance to people is undetermined (MSK, Maca).
Tribulus side effects in more detail
The headline reports are rare, but they are serious enough to take seriously. The listed ones are kidney toxicity, a case of severe hyperbilirubinemia with acute renal failure, toxicity suggestive of acute tubular necrosis, and priapism. Raised aminotransferases and creatinine have also been reported (MSK, Tribulus terrestris).
Interactions are listed with diuretics, blood pressure medicines (additive lowering), diabetes medicines, clopidogrel and drugs moved by P-glycoprotein. Men with prostate cancer should consult their physician (MSK, Tribulus terrestris).
An erection longer than four hours, chest pain, fainting or sudden vision or hearing loss needs emergency care. Dark urine, yellow skin or a large drop in urine output needs a call to your doctor the same day.
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See packsWhat does the label let a gummy hold?
The Stallion Power label lists Maca Extract second and Tribulus Terrestris eighth in an 82 mg blend with no per-ingredient amounts. Blend lines go in descending order by weight (21 CFR 101.36, Supplement Facts).
| Ingredient | Place | Plain ceiling | Tighter ceiling |
|---|---|---|---|
| Maca extract | 2 | 41 mg | 33.5 mg |
| Tribulus terrestris | 8 | 10.25 mg | 5 mg |
The tighter figures use the printed 5 mg of caffeine in fifth place. They are arithmetic on a label, not lab results, and a real gummy can hold less. None of the cases above report an amount, so we cannot say whether such small amounts cause any of them. See the maca page and the tribulus page.
A sensible next step
Keep taking prescribed medicine, tell your doctor about every supplement and stop use after any reaction, as the label says. Our side effects guide covers the whole blend.
Who wrote this01
Written and reviewed by
Pages built from the label, the sales page and linked NIH, FDA, FTC, NIDDK, AHA and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by Gostallionpower, a Stallion Power U.S. merchant desk, not by the manufacturer or the distributor named on the label. We earn money when you buy through our order links.
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