Visual signs of degradation Injectable GHK-Cu changes: Clear to cloudy (bacterial growth or precipitation) Color change (bluish, greenish tint from copper oxidation) Particles floating in solution Separation or settling Topical serum changes: Darker color (oxidation) Layer separation Texture changes (thicker or thinner) Crystallization Powder changes: Color darkening Clumping (moisture absorption) Greenish or bluish tint Loss of fine powder consistency Smell and texture changes Off odors: Metallic smell intensifying (some metallic odor is normal for copper peptides) Sour or rancid smell (bacterial contamination or lipid oxidation in serums) Any unusual smell different from when first opened Texture issues: Serum becoming grainy Unusual thickness or thinning Sticky residue Separation that doesn't re-mix Effectiveness loss Signs of reduced potency: Reduced healing speed (injectable) Less visible skin improvement (topical) Need to use more product for same effect Complete lack of expected results When in doubt: Discard and get fresh product

Each sample was analyzed with three biological replicates and three technical duplications
[DOI] [PubMed] [Google Scholar] 11.Andreassi L, Giannetti A, Milani M, Scale Investigators Group Efficacy of betamethasone valerate mousse in comparison with standard therapies on scalp psoriasis: an open, multicentre, randomized, controlled, cross-over study on 241 patients
BPC-157 is a synthetic peptide fragment derived from a protein sequence originally identified in gastric juice, while TB-500 is modeled after Thymosin Beta-4, a naturally occurring protein involved in cellular processes