PubMed Wang X, et al
Improper handling, particularly mechanical agitation like shaking, is a well-documented cause of peptide bond degradation in laboratory settings, which is why standard protocols emphasize gentle mixing over vigorous mixing at every stage
Purity, potency, and contamination vary wildly
Brands should ask about GHK-Cu concentration, pH range, ingredient compatibility, preservative system, color stability, packaging protection, and storage conditions
Before using the peptide, remove from cold storage and allow the peptide to equilibrate to room temperature before removing the lid of the container, in order to reduce the uptake of moisture that is present in the surrounding atmosphere
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