BPC-157 and the gastric pentadecapeptide literature

What the preclinical record shows, from the original pentadecapeptide work through stability questions.

Thymosin β4: sequence, fragments, and what TB-500 is

Why the 43-residue parent and the marketed fragment are not the same molecule — and how a COA says so.

GLP-1 analogs as research standards

Retatrutide's triple-agonist modification map — GLP-1, GIP and glucagon receptors in one sequence — and why identity testing matters more than purity alone for analogs.

Reading a peptide COA like a reviewer

Purity at 220 nm, mass confirmation, water content, residual solvents — field by field.

Endotoxin limits for in-vitro work

What ≤0.25 EU/mL means, how kinetic LAL works, when your protocol needs tighter.

GHK-Cu: copper complexation and why ICP matters

A tripeptide is easy; a copper complex is only as good as its metal content.