≥ 99 % purity research peptides. CoA, HPLC trace and lot number on every vial. Factory-direct from our California release lab — flat $14.99 U.S. shipping, no resellers, no overseas re-labelling, no middleman markup.
Six flagship peptides across our three mechanism families — GLP-1 & metabolic, tissue repair & growth hormone, cellular & longevity. Fifteen research peptides in total.
Every batch, every SKU, every tier. No release without all four.
Independent mass-spec identity and HPLC purity per batch. Anything below release threshold is destroyed before it ships.
Sequence verification, mass-spec ID, HPLC purity — and where applicable endotoxin + water content — archived against each lot number.
Insulated packaging sized to the destination ZIP — longer transit zones get a larger thermal mass. Included at no extra cost.
One synthesis run, one HPLC pass, one CoA, one lot number. No batch drift mid-experiment, no re-labelling, no drop-shipping.
Our manifesto
We built Puripep because researchers deserve a supply chain they can actually verify — not marketing copy and unverified purity claims.
Most suppliers
Trust us, it’s 99% pure.
The new standard
Here’s the CoA. Verify it yourself.
Same molecule, same dose. Purity per vial, price per vial, shipping fee per order. The right column reflects the modal price observed across three large U.S. online research suppliers at publishing time.
Labs running protocols and clinics doing their own compounding both pull from the same lots. Identical CoA, identical lot stamp, identical purity threshold. Pick the workflow.
Each vial ships with sequence-verified identity, mass-spec confirmation and lot number printed on the label. Lab accounts get CoA archive and reorder history out of the box.
Same release lots, same CoA, same lot tracking — pulled from the same shelf. Discreet outer packaging, end-to-end carrier tracking, flat shipping fee.
Five essentials below. Storage, shipping, returns and the full FAQ list live on the FAQ page →