Live vendor comparison
Cheapest P21 Peptide — 2026
The cheapest P21 Peptide right now is $67.99 at SomaChems (per 10mg). We compare 3 vendors with normalized $/10mg pricing so you're comparing apples to apples. Confirm the final price on the vendor site.
P21 Peptide pricing across our tracked vendors ranges $67.99 (cheapest) to $232.00 (most expensive) — a 241% spread for what should be the same compound. Median is ~$98.00. 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 mg-denominated listing to a 10mg equivalent so you can compare unlike vial sizes on the same basis.
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.
Before you buy