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Interest in immune-supportive therapies increased significantly during and after the pandemic era, and antioxidant IV therapy remains popular among patients prioritizing preventive health
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
Written dates, storage logs, and conservative discard rules are more useful than trying to read peptide quality by eye
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