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For example, medical assistants who work in certain departments such as allergy or primary care may need to give injections more than with other specialties

Key Takeaways "Safety" depends on context: Laboratory handling safety, compound purity, and clinical safety profiles are three different questions Purity is the #1 variable: A 98% pure peptide and a 70% pure peptide are not the same product contamination is the primary risk factor Third-party testing is the standard: Vendor-provided COAs are a starting point

Common impurities to check include truncated peptide sequences (Gly-His or His-Lys fragments), residual coupling reagents and protecting groups, counterion residues, free (uncomplexed) GHK, and excess copper salts