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No refrigeration is required for the topical serum, though it should be used within 90 days of opening to ensure peptide stability
If you read content stating that GHK-Cu injectable is illegal in the United States, including our own earlier version of this post, that information is outdated as of April 2026
Some users report thicker, stronger hair after consistent use of copper peptide serums or shampoos , making them one of the best copper peptides for hair growth
It requires careful administration and may be recommended by healthcare providers for those seeking more direct or intensive benefits
Its a synthetic version derived from a protein naturally found in gastric juice
