COA comparison snapshot
| Supplier | COAs | Testing methods | Research-use labeling | Review |
|---|---|---|---|---|
| Purity Peptides | Published per-batch COAs | Third-party tested · HPLC + mass-spec COA | Clear research-use-only framing | Read review |
What counts as a useful COA?
Batch-specific document
The COA should match the lot/batch being sold, not a recycled marketing PDF.
Identity testing
Purity percentage alone is not enough; identity confirmation matters.
Method shown
Look for HPLC and mass spectrometry context rather than vague “lab tested” claims.
Recent date
Testing should be reasonably current and tied to the current inventory.
Research-use labeling
Supplier copy should avoid human-use dosing and treatment claims.
Reader protection
COA guideDo not confuse a COA with medical safety.
A COA can help evaluate identity and purity claims for laboratory materials. It does not establish safety, dosing, legality or clinical suitability for human use.