Built for the researcher who reads the fine print.
Purity Peptide started with a simple frustration: research-grade peptides shouldn't require a leap of faith. If the lab you're buying from can't tell you the exact HPLC method, the endotoxin level, and the storage window in plain English — they shouldn't be shipping compounds.
What every vial must clear.
Independent third-party HPLC
Every lot is analyzed by an outside ISO-17025 lab — never by the manufacturer we source from. If a batch tests below 99% purity, it doesn't leave the freezer.
COA on every vial
The certificate of analysis you download is lot-matched to the vial number on your sticker. Methods, endotoxin panel, and bioburden testing are printed on it, not summarized.
3–5 business day shipping
USPS Priority Mail with tracking on every order. Free at $200+. Ships in 3–5 business days after payment confirmation.
Storage protocols documented
Lyophilized shelf life and multi-use vial handling are documented per compound. No guessing.
Transparent pricing
We audit six vendors every Monday. Our published prices already beat them, so you never need a coupon to know you're getting the fair rate.
The chain of custody.
Solid-phase peptide synthesis in an ISO-certified US facility.
Reversed-phase HPLC to isolate the target compound above 99%.
Third-party lab runs identity (LC-MS), purity, endotoxin, and bioburden.
USPS Priority Mail with tracking. Ships within 24 hours of payment confirmation, delivered in 3–5 business days.
Questions before you buy? Read the FAQ.
Twenty-plus of the most common questions on shipping, storage, dosing math, legality, and returns — answered honestly.