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Watch for signs of allergic or hypersensitivity reactions such as sudden rash, hives, swelling of the face or throat, difficulty breathing, or rapid heartbeat

Over-the-counter copper peptide products are typically cosmetic-grade, much lower in concentration, and mass-produced to have a shelf life of about a year

It cannot establish both molecular identities, the declared ratio, net quantity, uniformity, aggregation, stability or microbiological quality

Exposure to ambient moisture (e.g., from repeatedly opening a vial in a humid environment, or from a vial seal failure) introduces water that can degrade the peptide