Compare peptide purity across brands using real third-party lab tests from Peptigrity — with the test spread (not just an average) and net peptide content (how many mg are actually in the vial), both computed from the lab database. Built on independent tests: no test can be paid for, hidden, or removed.
Select a peptide to compare purity, spread, and net content across brands.
Peptide purity is one of the most important quality indicators. Higher purity means fewer impurities, degradation products, and potential contaminants. Third-party lab testing by independent laboratories provides the most reliable purity data — more trustworthy than vendor-provided certificates.
But purity alone doesn't tell the whole story. Always check the test count. Eight tests all landing at 99%+ is far stronger evidence than a single test at 99.9% — which is why this tool shows the spread and flags single-test brands.
HPLC separates a peptide sample into its individual components and measures the proportion that is the target peptide versus impurities. 99% purity means 99% of the sample is the target peptide.
| Purity Range | Classification | Typical Use Case |
|---|---|---|
| ≥ 99% | Excellent | Quantitative research, sensitive assays |
| 98–98.9% | Research grade | General research applications |
| 95–97.9% | Marginal | Screening, preliminary research only |
| < 95% | Below standard | Not suitable for most applications |
Results come from independently commissioned tests (samples purchased anonymously and tested blind), verified community-submitted reports, and vendor-submitted third-party results — all linked to the original lab documentation. No test can be paid for, hidden, or removed, the same independence promise as the Trust Score. For guidance on commissioning your own test, see how to get your peptides independently tested.
This tool is for educational and informational purposes only and does not constitute medical advice. Peptides discussed may be investigational compounds not approved by the FDA for human use. Peptigrity is an independent review platform and does not sell, endorse, or recommend specific products or vendors.