Questions. answered.
Concise, factual answers to the questions people actually ask — with the full guide for each.
What is peptide purity?
Purity is the share of the peptide-containing material in a sample that is the target peptide, usually measured as HPLC peak area. It doesn't account for water, salts, or counterions.
Peptide purity guideWhat does 99% purity mean?
It means about 99% of the peptide fraction is the correct peptide — not that the vial is 99% peptide by mass. Peptide content is the separate number for that.
Purity vs. contentWhat is HPLC testing?
High-performance liquid chromatography separates a sample into its components; the purity number on a COA is the main peak's share of total peak area.
HPLC explainedWhat is LC-MS testing?
Liquid chromatography paired with mass spectrometry. It weighs the molecule to confirm its molecular weight matches the labeled sequence — the core of identity confirmation.
LC-MS guideWhat should be on a peptide COA?
A batch number matching your vial, test dates, the lab's name, the methods used, and results for purity, content, and identity. Endotoxin and sterility panels are a strong plus.
How to read a COAWhat is peptide identity testing?
Laboratory confirmation that the material is the peptide on the label — primarily molecular weight by mass spectrometry, supported by sequencing or composition analysis.
Identity testingWhat is the difference between purity and content?
Purity describes the peptide fraction's composition. Content measures how much of the vial's total mass is peptide at all, after water, salts, and counterions.
Peptide contentWhat is a batch-specific COA?
A lab report for the exact production lot you received, with a matching batch number. Generic 'typical' COAs describe no specific batch and verify nothing.
Batch-specific COAsWhat is retatrutide?
An investigational GLP-1/GIP/glucagon triple-agonist peptide in Phase 3 trials, not approved for human use. Its Phase 2 trial showed roughly 24% mean weight reduction at the highest dose over 48 weeks.
Retatrutide guideWhat is BPC-157?
A synthetic 15-amino-acid peptide derived from a human gastric juice protein, studied for wound and tissue healing in animals. It has no published human clinical trials.
BPC-157 guide