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
These pass into the digestive system in the same way as food and are broken down to release the additional vitamin
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With hundreds of published studies, it is one of the most researched peptides in regenerative biology demonstrating systemic activity across tendons, ligaments, muscle, bone, gut epithelium, and neural tissue through the nitric oxide system, growth hormone receptor signaling, and angiogenic pathways
Soft melting light blue balm texture glides gently and absorbs quickly without heavy greasiness