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Find out in the Biotin (B-7) section of our B Vitamin Supplements Review, which also discusses the evidence for biotin for treating brittle nails and hair loss

The Hostynek and Maibach group at UCSF measured exactly this in 2011: human skin permeation of GHK-Cu as a function of skin layer, with the result that the peptide accumulates in the upper stratum corneum but does not pass through to viable epidermis or dermis in any meaningful quantity 4

Adults - Take 1 sachet per day with food or as directed by a healthcare professional

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10.3390/metabo10020071 Metabolites

Do not flush unused medications or pour down a sink or drain.