Buyer guides
Plain explanations of the numbers and checks on this site: prices per mg, lab scores, certificates of analysis and store domains. They compare and explain; they are not medical advice.
- Kits vs single vials: why the price per mg differs so much
Why 10-vial kits cost a fraction per mg of single vials, with Sep 25, 2026 medians for four peptides and the trade-offs buyers weigh. - How to read a certificate of analysis
What HPLC purity, mass spec identity, batch numbers and test dates on a COA tell you, the red flags to look for, and how to check a report with the lab. - What a Finnrick score means, and what it doesn't
What Finnrick's Purity focus score measures, why few tests pull it toward the middle, and why PeptidesGrid shows it only on Finnrick-listed domains. - How to check a peptide store's domain before you pay
Six checks for lookalike peptide store domains: letter-by-letter comparison, endings, extra words, copied catalogs and payment risk, with dated examples.