Buyer guides
Plain explanations of the numbers and checks on this site: prices per mg, lab scores, certificates of analysis, store domains, payment methods, approval status and FDA warning letters. They compare and explain; they are not medical advice.
- Peptide kits vs single vials: why the price per mg differs
Why 10-vial kits cost a fraction per mg of single vials, with current 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. - How to check a COA with the lab that issued it
How to confirm a peptide COA with the lab that issued it: lookup pages, codes and red flags for the 10 labs stores cite most, checked Sep 25, 2026. - 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 beside stores it can tie to the vendor. - 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. - The real price: shipping, minimums and pack sizes
Why the lowest price per mg may not be the cheapest order: pack sizes, shipping fees, free-shipping thresholds, minimums and currency, with Sep 25, 2026 data. - Paying a research peptide store: what each method means if something goes wrong
What card, PayPal, Zelle, Cash App, Venmo, bank and crypto payments let you do if an order never arrives, with current counts of what stores accept. - Which of these peptides are FDA approved, or approved elsewhere?
Status of all 54 peptides, checked Sep 25 and 26, 2026: approved in the US, EU or Canada, approved elsewhere, in clinical trials, or not approved. - Are research peptides legal in the US? What FDA warning letters say
What an FDA warning letter is and is not, why FDA writes to research use only sellers, close-out letters, and how to search letters, checked Sep 26, 2026.