PepFit Shannon

I only recommend peptide sources that treat testing like a science, not a slogan. Every batch goes through multi-step analysis — HPLC, LC-MS, sterility and endotoxin checks, plus batch-specific COAs that prove what's in the vial, not just what's on the label.

Most vendors stop at a single purity number. I only work with labs that go above industry norms with independent validation, cGMP-level quality systems, and full transparency so you can see exactly how your peptides were tested — built for serious research use only.