P21
Peptide Compare tracked 7 vendors selling P21 on 10 Oct 2026. The cheapest in-stock 10 mg vial is $8.50 per mg at Soma Chems, 45% under the $15.40 median. Prices are scraped from vendor sites; trust scores come from Finnrick blind tests.
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Best value right now · 10 mg
Soma Chems
IN STOCKUNTESTED
Per mg45% under the $15.40 median
Vial price10 mg · verified Oct 10
Avg per mg · 10 mg
$14.77+73.8%
Ranged $8.50 – $17.62 across 7 vendorsCompare 4 vendors · 10 mg
Across all sizes, verified in-stock listings run $84.99 to $198.00 from 3 vendors.
VendorStock
P21 prices verified Oct 10, 2026
$8.50/mgSoma Chems · $84.99
Buy best priceSee how P21 moved against the rest of the catalogue in the Peptide Price Index: median price per mg now versus 30 and 90 days ago, every tracked peptide, with a CSV.
P21 price by vial size
| Vial size | Lowest per mg | Vial price | Vendor |
|---|---|---|---|
| 5 mg | none verified in stock | 3 vendors carry it | |
| 10 mg | $8.50 | $84.99 | Soma Chems4 vendors carry it |
Verified 10 Oct 2026. Lowest figures are in-stock listings checked within the last week, with any coupon applied; a size with none says so.
Price movement · 30 days
0%median per mg, all sizes
Cheapest ever recorded: $8.50/mg on Feb 26. Today matches it.See our top-ranked P21 vendors
Ranked by Finnrick trust score, independent lab testing, and price.
Compare P21 head-to-head
All peptide comparisonsQuick Summary
A research peptide available from 7 vendors. Available from 7 vendors, priced from $84.99 to $1149.50.
- 5 of 7 vendors currently have it in stock
- Highest-rated vendor: Simple Peptide (7.0 Finnrick score)
- Most common vial size: 10mg
- Category: Cognitive / Neuro — Nootropic and neuroprotective peptides
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