GigantX Review 2026Does It Actually Work?

What is in it, per 2 capsules: L-citrulline malate 350 mg, beet root extract 300 mg, shilajit extract 150 mg, Korean ginseng 150 mg, ginkgo 80 mg, caffeine 40 mg, cayenne extract 20 mg, black pepper extract 2 mg and zinc 10 mg.

What the evidence says:

• We found no trial showing that any oral supplement enlarges the penis. A Cleveland Clinic article says of such pills that "there's no evidence they work".
• The one citrulline trial we read used 1.5 g a day of citrulline; GigantX has 350 mg of citrulline malate.
• Ginkgo did not beat placebo for sexual dysfunction in two trials, and it can raise bleeding risk with blood thinners.

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.

• L-citrulline malate 2:1: 350 mg, which is about 230 mg of citrulline if the 2:1 ratio is by weight (our calculation), versus 1.5 g a day of citrulline in the 2011 study. About 15%.
• Shilajit: 150 mg versus 500 mg a day (250 mg twice) of purified shilajit. 30%, and that study measured testosterone, not erections.
• Korean ginseng: 150 mg of extract, about 7.5 mg of ginsenosides (our calculation); the Cochrane abstract gives no dose.
• Ginkgo: 80 mg versus 240 mg a day in the 2004 trial, which found no difference from placebo. 33%.
• Beet extract 300 mg, cayenne 20 mg, caffeine 40 mg: no sexual-function trial to compare. The beet extract holds about 4.5 to 8.3 mg of nitrate (our calculation).
• Zinc: 10 mg, 100% of the reference intake and within the NHS limit of 25 mg.
• Penis size: no dose in any trial, because no trial shows an effect.

The directions say 2 capsules a day with about 300 ml of water; the vendor's FAQ says one morning and one evening. A pack of 60 capsules lasts a month.

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

• Label with doses: yes. All nine lines are dosed on the product's own pages and by NuviaLab.
• Identifiable company: no. The German terms name "Key Player Limited" in the Dubai Airport Freezone; the English terms name "GigantX.com" in Hong Kong. Both exclude EU law. The label says "GigantX" 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 or certificate appears.
• Study on the finished product: no. The page promises "increased penis size - up to several centimeters" and cites nothing.

NuviaLab, the co-seller, has 1.9 out of 5 from 148 reviews on Trustpilot.

Correction. An earlier version of this review never mentioned that the vendor sells GigantX as a penis-enlargement pill, listed L-arginine, maca, tribulus and fenugreek (none is in it), showed a three-row dose table that left out the main actives, scored it 8.8 out of 10 in the text and 4.5 out of 5 "Excellent" in the box while ranking it 15th of 21, showed a 90-day guarantee, free shipping and GMP certification, and priced it at $57 a bottle. The real US prices are $53.99, $107.98 and $161.97, 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 49.99 for 1 pack, CHF 99.98 for 2+1 (CHF 33.33 each), CHF 149.97 for 3+3 (CHF 25.00 each), plus CHF 9 shipping by card or CHF 37 cash on delivery.
• US site: $53.99, $107.98 ($35.99 each) and $161.97 ($26.99 each), plus $12 shipping.

That is about $1.80 a day for one pack and $0.90 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 vendor says effects appear "in the first month", which is longer than the window.

• Ginkgo: the NCCIH says it may increase bleeding risk in people taking anticoagulants such as warfarin. The label adds cautions for aspirin-type drugs, NSAIDs, paracetamol and diuretics.
• Caffeine: 40 mg per serving. The label says not to combine it with other products that are a source of caffeine.
• Zinc: 10 mg is within the NHS limit of 25 mg.
• Label caution: "Do not exceed the recommended daily allowance."

The page lists no side effects, and we found no safety data on the finished product.