The Truth About Peptide Purity: Why 99% Makes All the Difference

Purity Matters

The difference between 95% and 99% purity is not “just 4%.” Impurities can include incomplete sequences, deletion peptides, synthesis byproducts, salts, endotoxins, and unknowns.

Reading a COA

• HPLC: Should show one dominant peak (purity).

• Mass Spec: Confirms molecular weight/identity.

• Endotoxins: EU/mg levels appropriate for research.

• Batch Specificity: Fresh, lot-matched reports only.

Our Standards

• 99%+ purity minimum

• Third‑party verification

• Stability testing and chain‑of‑custody documentation

Bottom line: High purity = reproducible results, accurate dosing, and fewer confounders.