Faurschou A, Gyldenlve M, Rohde U, Thyssen JP, Zachariae C, Skov L, et al
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Even if the peptide is eventually returned to the freezer or refrigerator, extended exposure to higher temperatures causes gradual degradation

Topical GHK-Cu serum shelf life Pre-made commercial serums: Usually 6-12 months unopened 3-6 months after opening Check manufacturer recommendations Refrigerate after opening extends life DIY serums (mixing powder with carrier): Shorter shelf life than commercial 2-4 weeks typical (no preservatives) Must refrigerate Discard if color changes Factors affecting topical shelf life: Preservatives: Extend significantly pH: Neutral pH more stable Carrier: Some better than others (hyaluronic acid, glycerin good) Storage: Cool, dark, sealed Contamination: Sterile technique critical Best practices for topical GHK-Cu: Buy small bottles (use within 3-6 months) Refrigerate after opening Don't double-dip (pour into hand, don't touch dropper to skin) Watch for color changes (brown = oxidized) Replace every 6 months even if looks fine See our how to reconstitute peptides , bacteriostatic water for peptides , and how long reconstituted peptides last in fridge

Notably, patients with IBS-D were ~87% less likely than those with IBS-M to have high-switch trajectories, aligning with our hypothesis that diarrhea-predominant physiology may tolerate GLP-1RA-induced motility changes better
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