Top pick: semen-volume supplementsProduct trial published67-day guarantee
Semenax Review — Ingredients, Evidence & Verdict
Written by the WellnessChecked Editorial Team. We checked the formula, the guarantee terms and the published research on its ingredients.
✍️ WellnessChecked Editorial Team✅ Sources listed on this page
Semen-volume supplements
Best for
1 product trial
Evidence
67-Day
Guarantee
Scroll down to read our full analysis, including ingredient breakdown, pros & cons, and where to buy safely ↓
📋 Editorial & Affiliate Disclosure: This review was written by the WellnessChecked editorial team. We only cover products from brands we have affiliate relationships with, so our top picks are the best of the products we cover, not of every product on the market. We earn a commission if you purchase through our links — paid by the manufacturer at no extra cost to you. We aim to describe every product accurately, including its limits. Read about our methodology → | Full disclaimer →
⚡ Quick AnswerLast Reviewed: October 2026
Semenax is our top pick among semen-volume supplements. It's one of the few volume supplements where the product itself has been tested in a placebo-controlled trial: after two months, average ejaculate volume in 63 men rose from 2.49 to 2.97 ml on Semenax and fell slightly on placebo. That trial was small, funded and co-authored by the maker, and found no clear benefit for men with low volume or for sperm quality, sexual function or orgasm. It comes with a 67-day money-back guarantee with strict conditions.
The one published trial of Semenax randomized 78 men aged 30–60 at six sites in India (2011–2012); 63 were in the main analysis. After 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. Sperm count, motility, sexual function and orgasm scores didn't differ significantly. The trial was funded by the maker, its lead author is affiliated with the company, it was published about 10 years after it finished, and it hasn't been repeated.
Semenax may suit healthy men who want to try a modest boost in ejaculate volume and are willing to buy direct and track the 67-day return window. Its single trial is small, company-funded and showed no clear benefit for men with low volume, sperm quality, erections or orgasm.
In this review we go through what's in Semenax, what the trial actually found, the side effects and the guarantee terms. Read the full analysis below before making a decision.
Semenax at a Glance
Ingredients
16 listed ingredients (amino acids, zinc, vitamin E and herbs). Amounts aren't on the sales pages; the trial paper lists the tested formula's doses, some of them low (e.g., 250 mg L-arginine).
Evidence
One published two-month trial of the product (63 men analyzed) with a modest volume increase vs placebo. Company-funded, not on PubMed, not repeated.
Transparency
Named company with real addresses, full study report published, written guarantee terms. Doses only in the trial paper.
Safety
Mostly mild stomach complaints in the trial. L-arginine and hawthorn can interact with nitrates, ED drugs and blood pressure medicines. Counterfeits documented.
Value
About $59 for one bottle (30 days), down to about $33 a month on the 12-bottle deal (October 2026).
We compare products on ingredients and doses, published evidence, transparency and guarantee terms, safety and value. How we review →
What Is Semenax?
Semenax is an amino acid and herbal blend from Leading Edge Health (Victoria, BC, Canada), marketed to increase semen volume. The official ingredients page lists 16 ingredients, including Swedish flower pollen, L-arginine, L-lysine, zinc, L-carnitine, pumpkin seed, maca, vitamin E, pine bark extract and Butea superba, with no amounts. It is one of the few volume supplements with a placebo-controlled trial of the product itself, though that trial was small, short and company-funded.
*Dietary supplement. Not intended to diagnose, treat, cure or prevent any disease. Statements not evaluated by the FDA.
Active Ingredients — Full Scientific Breakdown
What each listed ingredient is and what human studies have looked at. Where the maker doesn't disclose doses, we can't say whether they match the studies:
Swedish Flower PollenPollen Extract
Flower pollen extracts have been studied mainly for prostatitis and urinary symptoms; we found no evidence that they increase semen volume on their own. The pollen study often cited for Semenax (Elist 2006) tested a different product for chronic prostatitis. The trial formula contained 50 mg a day.
L-Arginine HClAmino Acid
An amino acid involved in nitric oxide production; the 250 mg daily dose in the trial formula is far below the gram-level doses used in most arginine studies.
L-LysineAmino Acid
An amino acid; we found no good human evidence that lysine with zinc raises testosterone or semen volume.
Zinc (Aspartate and Oxide)Mineral
Zinc deficiency can impair sperm production; extra zinc is unlikely to help men who already get enough. The trial formula listed 30 mg of zinc aspartate a day.
Butea SuperbaHerb
A Thai herb and, at 500 mg a day, the largest single ingredient in the trial formula. It has little human research, including on hormone safety.
Also in the current formula: L-carnitine, catuaba bark, pumpkin seed, maca, vitamin E, pine bark extract, muira puama, hawthorn, cranberry extract, sarsaparilla and Avena sativa (oat) extract. The trial formula also contained epimedium and Tribulus terrestris, which aren't on the current list; we couldn't confirm whether the formula has changed.
📋 Our Editorial Concerns
In the interest of balance, here are the limitations of Semenax that we think buyers should know:
→The refund window closes 67 days after delivery, so decide whether it is working before then
→The trial found no significant benefit in men with low volume (under 2 ml), the group the product targets
→The price is not justified by strong evidence; judge it against the limited research described above
→Counterfeits have been sold (one contained hidden yohimbine), and the guarantee covers the company's own orders
Results Timeline: What to Expect
What the one published trial measured, and what isn't known. Individual results vary:
1
Weeks 1–4: No Reliable Data
The trial did not measure early effects; it reported results at two months. We have no verified data on earlier changes.
2
Month 2: When the Trial Measured Results
After 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 20%+ increase, versus 16% on placebo.
3
Before Day 67: Decide on the Refund
The guarantee lets you try it for 60 days and requires returns to arrive within 67 days of delivery. If you've noticed no change by then, the refund is the sensible option.
⚠️ Important: Individual results vary, and nothing here is a promise. The 67-day guarantee has strict conditions: returns must arrive within 67 days of delivery (see below).
🔬 What the Evidence Actually Shows
Trial of the product itself: One randomized, double-blind trial (MacKay et al., 2022; run in India in 2011–2012): 63 men analyzed over two months, with average volume up from 2.49 to 2.97 ml vs a small fall on placebo. No significant difference in sperm quality, sexual function or orgasm, and no clear benefit in men with low volume. Funded and co-authored by the maker, not on PubMed and not repeated.
Ingredients: Little direct evidence for semen volume. The pollen research usually cited tested a different product for prostatitis, 250 mg of L-arginine is far below the doses used in most studies, and zinc helps mainly when someone is deficient.
Doses on the label: Not on the sales pages. The trial paper lists daily amounts for the tested formula, which also included epimedium and Tribulus terrestris (not on the current list).
Guarantee: Try for 60 days; empty containers (the first two opened plus any unopened) must arrive back within 67 days of delivery, no exceptions. Shipping isn't refunded; one refund per customer.
✓Has a randomized, placebo-controlled trial of the product itself
✓Maker publishes the full clinical study report
✓Established company with listed addresses and a written 67-day guarantee
✓Mostly mild stomach complaints in the trial
✗ Considerations
✗Only one small, company-funded trial; not on PubMed or independently replicated
✗No significant benefit in men with low volume, or on sperm quality, sexual function or orgasm
✗Ingredient amounts not on the sales pages; formula may differ from the one tested
✗Counterfeits are documented, and the guarantee has strict terms
⚠️ Who Should NOT Take Semenax
✗Anyone under 18 years of age
✗Anyone taking nitrates, ED drugs, blood pressure medicine, blood thinners or diabetes medicine without a doctor's OK
✗Anyone with a pollen allergy or asthma, or with surgery coming up
✗Anyone with a hormone-sensitive condition such as prostate cancer
✗Anyone hoping to improve sperm count or fertility (the trial found no effect on sperm quality)
This list isn't complete. Check with a doctor or pharmacist before taking any supplement.
Is Semenax Safe?
In its two-month trial, side effects were mostly mild stomach complaints. Natural ingredients can still cause side effects and interact with medicines, and a counterfeit 'Semenax' containing the undeclared drug yohimbine has been found in Australia, so buy direct.
✓ Side Effects in Studies
In its trial, side effects were mostly mild stomach complaints. Longer-term safety hasn't been studied.
⚠️ Consult Your Doctor If:
● You take nitrates, ED drugs or blood pressure medicines
● You take blood thinners or diabetes medicines
● You have heart failure or take digoxin (hawthorn)
● You have a pollen allergy, asthma or surgery coming up
● You have a hormone-sensitive condition such as prostate cancer
Where to Buy Semenax Safely
We suggest buying direct from the official website (semenax.com or leadingedgehealth.com). It lets you:
✓ Avoid counterfeits (a fake with hidden yohimbine has been documented)
✓ Qualify for the 67-day money-back guarantee (strict terms)
🛡️ 67-Day Money-Back Guarantee (seller's terms apply) · Official manufacturer only
*Individual results vary. Not intended to diagnose, treat, cure or prevent any disease. These statements have not been evaluated by the FDA. Full disclaimer →
🛡️ Final Verdict: Semenax
Semenax may suit healthy men who want to try a modest boost in ejaculate volume and are willing to buy direct and track the 67-day return window. Its single trial is small, company-funded and showed no clear benefit for men with low volume, sperm quality, erections or orgasm.
Best for: healthy men with normal volume who want to try for a modest increase and will track the 67-day return window.
Not for: men with low volume or fertility concerns (see a doctor), or anyone on nitrates, ED drugs, blood pressure medicines or blood thinners without a doctor's OK.
*These statements have not been evaluated by the FDA. Not intended to diagnose, treat, cure or prevent any disease. Individual results may vary. Full disclaimer →
Yes, one. A two-month, company-funded, placebo-controlled trial of 63 men found a modest average volume increase (about 0.5 ml) vs placebo, mainly in men who already had normal volume. Sperm quality, sexual function and orgasm scores did not differ significantly. It was published in 2022 in the Journal of Clinical Nutrition and Dietetics, isn't on PubMed and hasn't been repeated.
The only trial measured volume at two months; we have no verified data on earlier changes. The refund window closes 67 days after delivery, so decide whether it's working before then.
In its trial, side effects were mostly mild stomach complaints. Safety depends on your health and medicines: L-arginine and hawthorn can add to the effects of nitrates, ED drugs and blood pressure medicines, and L-arginine and vitamin E may raise bleeding risk with blood thinners. Check with a doctor or pharmacist if you take prescription drugs.
Buy from semenax.com or leadingedgehealth.com: counterfeits have been documented (including one with hidden yohimbine), and the guarantee is handled by the company against its own orders.
Anyone under 18, and anyone taking nitrates, ED drugs, blood pressure medicine, blood thinners or diabetes medicine without a doctor's OK. People with pollen allergies, asthma or hormone-sensitive conditions such as prostate cancer should check first too. A drop in semen volume can have medical causes, so it's worth raising with a doctor.
Also Consider
Other supplements in Men's Health you may want to compare:
Please note: This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before starting any supplement. Individual results vary. *Not evaluated by the FDA. Not intended to diagnose, treat, cure or prevent any disease.
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