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The reason for this discrepancy may be due to the different experimental conditions

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

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

( 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

The paper described it as approximately 10 million times more potent than BDNF at promoting synaptogenesis in cell culture models

Documentation (protocol, IRB/ethics review if applicable, data collection plan) is strongly recommended