Live vendor comparison
Cheapest Semax — 2026
Updated today
The cheapest Semax right now is $19.20 at Polar Peptides (per 10mg). We compare 28 vendors with normalized per-mg pricing so you're comparing apples to apples. Prices update continuously.
Semax pricing across our tracked vendors ranges $19.20 (cheapest) to $80.00 (most expensive) — a 317% spread for what should be the same compound. Median is ~$32.40. That's a huge spread, which usually means the cheapest vendor is either passing on bulk-buying advantage or cutting corners on QC. Always cross-check the cheapest vendor's COA before ordering. Cheapest vendor changes ~weekly based on restocks and discount cycling.
Why this page exists
Peptide prices vary wildly between vendors — sometimes by 3x or more for the exact same compound at the same purity. Vendors use different quantity sizes to obscure comparisons. PeptidePrices normalizes every price to a standard unit so you can see the real cheapest deal.
How we rank: Only in-stock listings are shown. Prices are deduplicated per vendor (cheapest variant only). Non-normalized listings (missing quantity data) are excluded. See our full methodology.
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