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Gently pat excess into skin to promote absorption

( 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

3) Subcutaneous injection Using an insulin syringe, draw 48 units as prescribed and inject subcutaneously (abdomen preferred)

It remains an investigational compound in Phase 3 clinical development

How Peptide Therapy Fits In Peptides are short chains of amino acids