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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

Lee has more than 10 years of professional experience in clinical pharmacy, academia, and research

GHK-Cu (copper tripeptide-1) is a cosmetic ingredient and is not approved by the FDA, EMA, or any comparable regulator for the treatment, cure, or prevention of androgenetic alopecia, telogen effluvium, or any other hair-loss condition

Aging Pathobiology and Therapeutics, 2019, 1(1): 01-04.