Testing 101
Read a real COA, compare purity and vial content, check endotoxin and TFA, and choose a lab for your next test.
Guides & posts
Find the question that brought you here. Browse the latest guides, or pick a topic below.
Residual Solvents
A 99% purity COA is only part of the picture. Learn what to ask about TFA, which solvent tests to order and how to challenge a vendor's claim.
The Visual Guide to Peptides: Normal Pucks vs. Red Flags
Broken puck or warning sign? Compare real vial photos, spot cloudiness and gelling, and know when to stop and take it up with the vendor.
Dictionary
Decode peptide chats, price lists and COAs. Plain-English meanings, buyer’s tips and the next guide to read.
Gray 101
A beginner’s guide to gray-market tirzepatide: vendor checks, 3P COAs, reconstitution basics and clear mg–mL–units examples.
Crypto 101
New to crypto payments? Understand stablecoins, wallet setup, withdrawal holds and the network checks that matter before you send.
Injection Pens 101
An illustrated introduction to preparing, filling and using a reusable injection pen for peptides.
Compounding Sources
Where does the ingredient come from, and what happens before it reaches your vial? Follow the supplier COAs, pharmacy replies and questions worth asking.