Also sold as p21 Peptide
For 50mg of P21, the lowest total is Rescue Research USA at $273.21 ($5.46 per mg, as 5 × 10mg), including its multi-vial discount, code PLUG (10% off) and $9.99 shipping. Next: Real Peptides at $345.60. We track 2 vendors carrying it.
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| Vendor | 5mg | 50mg | Per mg | Codes applied | Testing |
|---|---|---|---|---|---|
| Rescue Research USAprofile | $90.98 | $273.21 | $5.46 | PLUG 10% |
Purity, Endotoxin*, Metals* |
| Real Peptidesprofile | $51.35 | $345.60 | $6.91 | PLUG 20% |
Purity, Endotoxin* |
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 50mg total. Confirm the final price at checkout. *Testing marked with an asterisk is present on some batches, not all.
Buy at Rescue Research USA — code PLUG → See the full breakdown →| Strength | Vendors | Single vial | 10-vial kit | Per mg (kit) |
|---|---|---|---|---|
| 5mg | 1 | $51.35 · Real Peptides | $345.60 · Real Peptides | $6.91 |
| 10mg | 1 | $90.98 · Rescue Research USA | $455.44 · Rescue Research USA | $4.55 |
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 5mg, Real Peptides is lowest at $51.35 total. For 50mg, Rescue Research USA is lowest at $273.21 total ($5.46 per mg), including its multi-vial discount, code PLUG (10% off) and $9.99 shipping.
None of the 2 vendors we track for P21 publish endotoxin testing on every batch. Check the certificate of analysis on the product page.
P21 is sold in 5mg and 10mg vials. 5mg × 10: Real Peptides at $345.60 ($6.91 per mg); 10mg × 10: Rescue Research USA at $455.44 ($4.55 per mg).
None of the 2 vendors publish heavy-metals testing on every batch. Rescue Research USA publishes it on some batches.
For 50mg, totals run from $273.21 to $345.60 across 2 vendors — $5.46 to $6.91 per mg — including each vendor's multi-vial discounts, our discount codes and shipping. Before any discounts, list prices run from $9.00 to $9.60 per mg.