Also sold as p21 Peptide, P21 Adamantane
For 100mg of P21, the lowest total is PeptidePlugs at $729 ($7.29 per mg, as 1 × 10-pack of 10mg), including code PLUG (10% off, first order only) and free shipping. Next: Modern Aminos at $811.44. We track 2 vendors carrying it.
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| Vendor | 10mg | 100mg | Per mg | Codes applied | Testing |
|---|---|---|---|---|---|
| PeptidePlugsprofile | $141.50 | $729 | $7.29 | PLUG 10% first order only |
Purity, Endotoxin, Metals* |
| Modern Aminosprofile | $103.20 | $811.44 | $8.11 | PLUG 10% |
Purity, Endotoxin, Metals* |
Totals come from the same optimizer as our comparison tool: each vendor's cheapest way to supply the amount, with its multi-vial and mix-and-match discounts, the discount codes we hold for that vendor, and shipping to the US. Vendors reach each amount with whatever vial sizes they sell, and a vendor without a matching size may ship slightly more. Codes marked "first order only" assume a first order. "Per mg" is for the 100mg total. Confirm the final price at checkout. *Testing marked with an asterisk is present on some batches, not all.
Buy at PeptidePlugs — code PLUG → See the full breakdown →| Strength | Vendors | Single vial | 10-vial kit | Per mg (kit) |
|---|---|---|---|---|
| 10mg | 2 | $103.20 · Modern Aminos | $729 · PeptidePlugs | $7.29 |
Each strength is priced using only that vial size (single vials or packs of it), the same as choosing that size in the comparison tool. Totals include multi-vial discounts, our discount codes and US shipping.
It depends on how much you buy, because most vendors discount multi-vial orders. For 10mg, Modern Aminos is lowest at $103.20 total. For 100mg, PeptidePlugs is lowest at $729 total ($7.29 per mg), including code PLUG (10% off, first order only) and free shipping.
For 100mg, the lowest total overall — PeptidePlugs at $729 — is also from a vendor that publishes endotoxin testing on every batch. 2 of the 2 vendors do.
None of the 2 vendors publish heavy-metals testing on every batch. PeptidePlugs and Modern Aminos publish it on some batches.
For 100mg, totals run from $729 to $811.44 across 2 vendors — $7.29 to $8.11 per mg — including each vendor's multi-vial discounts, our discount codes and shipping. Before any discounts, list prices run from $8.10 to $9.80 per mg.