best injection site for ghk-cu peptide Dosage and Protocol: The 30-Day Cycle Glow Peptide | GHK-Cu, BPC-157,

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Contraindications : Individuals with a history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2 (MEN 2) should avoid these injections

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

Avoid sugary soda or too much caffeine