Semaxin Review 2026Is It Worth the Money?

What is in it, per 2 capsules: L-cysteine 240 mg, astragalus 200 mg, tribulus 180 mg (40% saponins), coenzyme Q10 150 mg, maca 125 mg, saffron 50 mg, vitamin E 30 mg, zinc 15 mg, folic acid 200 µg, selenium 55 µg and vitamin B12 2.5 µg.

What the evidence says:

• A 2020 JAMA trial of 2,370 men found 5 mg of folic acid plus 30 mg of zinc did not improve live birth. Semaxin has half the zinc and 4% of the folic acid.
• Cochrane rates the evidence for antioxidants in male subfertility as very low certainty; the live-birth benefit disappeared when high-risk studies were removed.
• Maca and tribulus did not change testosterone in the trials we read, yet the page says the product "stimulates the testosterone production process".

There is no money-back guarantee; the terms allow 10 days from purchase.

Our Dose Check compares each label amount with the best human study.

• Zinc and folic acid: 15 mg and 200 µg versus 30 mg and 5 mg a day in the JAMA trial, which found no benefit. 50% and 4%.
• Selenium and vitamin E: 55 µg versus 200 µg in an uncontrolled study of 690 men (selenium 28%); that study gave vitamin E in other units, so we do not compare it with the 30 mg.
• Coenzyme Q10: 150 mg; the meta-analysis abstract gives no dose, so no percentage.
• Maca: 125 mg of extract versus 1.75 to 2 g a day of powder in the fertility trials. About 6 to 7% (our calculation; extract versus powder).
• Tribulus: 180 mg versus 1,500 mg a day (12 weeks, better erectile scores) and 800 mg a day (30 days, no better than placebo). 12% and 22.5%.
• Saffron 50 mg, astragalus 200 mg, L-cysteine 240 mg: no dose or human trial to compare.

The directions say 2 capsules a day with about 300 ml of water before a meal.

Our Transparency Score checks five things a buyer can verify. Semaxin scores 2 out of 5.

• Label with doses: yes. All twelve lines are dosed on the product's own pages.
• Identifiable company: no. The German terms name "Key Player Limited" in the Dubai Airport Freezone; the English terms name "semaxin.com" in Hong Kong. Both exclude EU law. The label says "Semaxin" is a NuviaLab trademark. No manufacturer is given.
• Refund terms in writing: yes. 10 calendar days from purchase, unused goods only.
• Independent testing shown: no. No lab, certificate or test is named.
• Study on the finished product: no. The page offers testimonials only.

NuviaLab, the trademark owner, has 1.9 out of 5 from 148 reviews on Trustpilot.

Correction. An earlier version of this review listed L-arginine, L-citrulline, fenugreek and ginseng (none is in it), showed trial doses with no source, said the product is "third-party tested by an independent lab" and carried a "Lab Tested" badge (no Semaxin page names a test), scored it 9 out of 10 in the text and 4.5 out of 5 "Excellent" in the box while ranking it 16th of 21, showed a 90-day guarantee, free shipping and GMP certification, and priced it at $57 a bottle. The real US prices are $59.99, $119.98 and $179.97, and there is no guarantee. We have corrected it.

Prices when we checked in September 2026:

• Swiss site (where our link leads, in German): CHF 59.99 for 1 pack, CHF 119.98 for 2+1 (CHF 39.99 each), CHF 179.97 for 3+3 (CHF 29.99 each), plus CHF 9 shipping by card or CHF 37 cash on delivery.
• US site: $59.99, $119.98 ($39.99 each) and $179.97 ($29.99 each), plus $12 shipping.

That is about $2.00 a day for one pack and $1.00 a day for the six-pack (our calculation).

Refunds. The pages offer no money-back guarantee. The English terms say the customer may withdraw only "within 10 calendar days from the date of purchase of goods", that returns "must be preceded by a written statement", and that "Goods can not bear traces of use and must be pre-packed." They add: "The application of EU law is not possible." The antioxidant evidence is for 3 months or longer, so a 30-day pack cannot be tried inside that window.

• Label caution: "The products should not be consumed when using high blood pressure or diabetes medications." Our earlier text said only to combine it "cautiously".
• Zinc and folic acid: in the JAMA trial at higher doses (30 mg zinc, 5 mg folic acid), abdominal pain was 6% versus 3% and nausea 4% versus 2%, and sperm DNA fragmentation rose. Semaxin's doses are lower; we found no data at those doses.
• Antioxidants in general: Cochrane found mild gastrointestinal discomfort more common (OR 2.70).
• Vitamin E: 30 mg is far below the 540 mg a day the NHS says is unlikely to cause harm. Selenium: 55 µg is 100% of the reference intake.

The vendor says the formula is "100% safe" with "the absence of side effects". We found no safety data on the finished product.