Ingredient research
Tribulus Terrestris for Men: What Does the Vine Really Do?
Tribulus terrestris for men is marketed for libido and strength, but the evidence is mixed. Memorial Sloan Kettering says human studies of sexual function are mixed and the claim that it acts like testosterone is not clearly supported. Side effects include stomach irritation and rare case reports of organ harm.
Written by the Protoflow label deskUpdated · 4 min read
The vine01
What is tribulus terrestris and why do men take it?
Tribulus is a ground-hugging vine whose fruit is sold for libido and athletic drive (MSK, Tribulus terrestris).
Sellers argue it works like testosterone. Protoflow lists tribulus fruit at 120 mg per 2 capsules (Protoflow bottle label). The question is whether the argument holds.
Checked02
Does tribulus work for men's sexual health?
Human evidence is mixed, and the testosterone idea is not clearly supported (MSK, Tribulus terrestris).
| Claim | What the review says |
|---|---|
| Acts like testosterone | Not clearly supported |
| Boosts sexual function | Human studies are mixed |
| Improves athletes | One study found no gain |
| Safe | GI irritation; rare case reports of liver, kidney and nerve harm |
Cautions03
Who should be careful with tribulus?
Men with prostate cancer, and people on blood pressure, water or diabetes medicines (MSK, Tribulus terrestris).
- It may add to antihypertensives, diuretics and diabetes drugs
- Men with prostate cancer should ask a physician first, because of possible hormonal activity
- One case report describes a 72-hour painful erection
Heart disease, diabetes, medicines and stress can all lower desire (NIDDK, Erectile Dysfunction). A blood test, not a capsule, shows low testosterone (MedlinePlus, Male Hypogonadism).
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See packsNext step04
What is a sensible plan if you are thinking about tribulus?
See a clinician first, and treat any capsule as an experiment, not a fix.
Keep taking prescribed medicine, and bring the label to your appointment. Read the tribulus page and the post on tribulus and testosterone levels.
FAQ05
Tribulus questions for men
Is tribulus a steroid?
No. It is a plant, sold on the belief that it acts like testosterone, which the evidence does not clearly support (MSK, Tribulus terrestris).
Does tribulus build muscle?
One athlete study found tribulus alone did not improve androgen status or performance (MSK, Tribulus terrestris).
Can tribulus cause a long erection?
MSK cites one case report of an erection lasting 72 hours (MSK, Tribulus terrestris). Seek urgent care for an erection over 4 hours (MedlinePlus, Tadalafil).
Is 120 mg of tribulus a studied dose?
No established dose exists for tribulus (MSK, Tribulus terrestris).
Can tribulus affect the kidneys or liver?
MSK lists case reports of liver, kidney and neurological toxicity (MSK, Tribulus terrestris). They are rare but serious.
Who wrote this06
Written and reviewed by
Pages built from the label, the brand pages and linked NIH, FDA, FTC, NICE and peer-reviewed sources.
Last updated . See our editorial standards and how we check reviews. This website is run by a USA authorized Protoflow retailer, not by the manufacturer or distributor, PhytoThrive Labs. We make money when you buy through our order links.
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