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Does Semenax Actually Work? The Published Clinical Trial Reviewed
WellnessChecked Editorial · October 2026
Does Semenax Actually Work? The Published Clinical Trial Reviewed
Semenax was tested in one small, company-funded placebo-controlled trial. We review what it found for semen volume, what it didn't find, the ingredients and cautions.
⚡ Quick AnswerLast Reviewed: October 2026
It may modestly increase ejaculate volume. In Semenax's one published trial (63 men analyzed, 2 months), average volume rose from 2.49 to 2.97 ml on Semenax and fell slightly on placebo, a statistically significant difference. Sperm count, sperm quality, sexual function and orgasm didn't differ from placebo. The trial was small and funded by the maker. It's our top pick among semen-volume supplements.
The Published Clinical Trial
The trial enrolled 78 men aged 30 to 60 in India in 2011 and 2012; 63 were in the main analysis (32 on Semenax, 31 on placebo). They took 4 capsules twice daily for two months. Average ejaculate volume rose from 2.49 to 2.97 ml on Semenax and fell from 2.64 to 2.43 ml on placebo. Half the Semenax group had a volume increase of 20% or more, versus 16% on placebo.
The limits matter. The study was funded by Leading Edge Health, the lead author is affiliated with the company, and it was published about ten years after it was run. The benefit was significant in men with normal volume but not in men with low volume (under 2 ml), the group the product is aimed at. Sperm count, motility, sexual function scores and orgasm quality weren't significantly different from placebo, and no independent team has repeated it.
Older pages cited a 2006 study in the journal Urology. That study tested a different flower pollen product for chronic prostatitis symptoms, not Semenax and not semen volume.
Key Ingredients
The official ingredients page (October 2026) lists 16 ingredients with no amounts:
Swedish flower pollen
L-arginine and L-lysine (the trial formula had 250 mg L-arginine a day, far below the gram-level doses in most arginine studies)
Zinc oxide and zinc aspartate (zinc mainly helps men who are deficient)
L-carnitine, maca, catuaba bark, muira puama, Butea superba, pumpkin seed, pine bark extract, hawthorn, cranberry extract, sarsaparilla, oat extract and vitamin E
The trial formula also contained epimedium and Tribulus terrestris, which aren't on the current page. We couldn't confirm whether the formula has changed. For safety details, see Semenax side effects.
It may give a modest increase in ejaculate volume. Its one small, company-funded trial found volume rose more than on placebo over two months, but found no difference in sperm quality, sexual function or orgasm.
The trial measured results after two months. The company suggests trying it for 60 days, and returned containers must reach its warehouse within 67 days of delivery to qualify for a refund.
Avoid it if you take nitrates, and check with your doctor if you take ED drugs, blood pressure medicines, blood thinners, diabetes medicines or digoxin, because L-arginine, hawthorn and vitamin E can interact. Skip it with a pollen allergy, and ask a doctor if you have a hormone-sensitive condition.
Buy from the official site. The guarantee applies to orders through the company, and Australia's TGA found a counterfeit 'Semenax' containing undeclared yohimbine.
Semenax is our top pick among semen-volume supplements because it has a published placebo-controlled trial, though a small, company-funded one. Volume Pills is a volume alternative without a comparable published trial of its own.
Disclaimer: For informational purposes only. All products are dietary supplements — not medicines. Not intended to diagnose, treat, cure or prevent any disease. These statements have not been evaluated by the FDA. Individual results may vary. Always consult a qualified healthcare professional. We earn affiliate commissions via links on this page. Full disclaimer →
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