Understand the source comparison
Best SS-31 Supplier Third Party Tested 2026: Product Comparison
Real Peptides Third-party HPLC + MS + LAL on every batch Kinetic chromogenic LAL, reported in EU/mg Unique lot number with posted COA per batch ≥98% (typical 98.5–99.2%) Only supplier publishing full analytical reports (chromatograms, spectra, kinetic curves).
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- Real Peptides
- Third-party HPLC + MS + LAL on every batch
- Kinetic chromogenic LAL, reported in EU/mg
- Unique lot number with posted COA per batch
- ≥98% (typical 98.5–99.2%)
- Only supplier publishing full analytical reports (chromatograms, spectra, kinetic curves). Not summaries. ISO 17025 lab verification standard.
- Generic Research Chemical Vendors
- In-house HPLC only, selective third-party on request
- Rarely tested; if tested, gel-clot method only
- Lot numbers assigned but COAs not batch-specific
- 85–95% (high variability)
- Purity claims based on in-house equipment without independent calibration. Endotoxin levels frequently exceed 1.0 EU/mg.
- Compounding Pharmacy Sources
- USP monograph compliance (if available), varies by pharmacy
- Tested per USP <85> if pharmacy is 503B registered
- Batch records kept internally, not published
- 90–98% (pharmacy-dependent)
- Quality highly variable. 503B facilities maintain higher standards but SS-31 is not a USP-listed compound, so testing protocols are pharmacy-discretionary.
- International Peptide Suppliers
- COA provided on request, often outdated or generic
- Rarely included in standard testing panel
- Minimal. Same COA used across multiple shipments
- 80–95% (frequent below-spec batches)
- COAs frequently represent a reference batch, not the shipped product. Mass spectrometry confirmation uncommon.
- The comparison above reflects the verification landscape in 2026. Real Peptides' decision to publish batch-specific third-party COAs as standard practice. Rather than on request or selectively. Represents the highest transparency standard currently available for research peptides. When your mitochondrial function assays depend on exact cardiolipin binding, the documentation behind the purity claim matters as much as the number itself.