One report is one vial. What separates two shops is the record over time:
- How many tests each shop has on file for that compound, and how recent the latest one is.
- Net content, not just purity: did the vials hold what the label says?
- Endotoxin or sterility results, if you're going to inject it.
- What buyers say about delivery in each shop's reviews.
Compare peptide shops puts two shops side by side.
Net content is where vials fall short more often than purity. Across the Purity Index, 7.23% of net-content tests came in under 95% of the label, against 0.28% of tests below 95% purity (verified September 2026). Two 99% purity reports can sit on very different fill results.