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This guide breaks down exact shelf life for each major peptide category, what factors affect longevity, how to recognize degradation, optimal storage practices, and when to mix fresh batches

( Wiley Online Library ) Where the evidence is still a bit thin Topical anti-wrinkle outcomes: a 2025 review on topical GHK as an anti-wrinkle peptide points out practical limitations (like stability and penetration) and highlights that clinical studies are surprisingly limited compared to how widely its promoted

However, it is important to note that GHK-Cu is not an MHRA-approved medicine in the UK

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