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Vouldoukis I, Lacan D, Kamat C, Coste P, Calenda A, Mazier D, et al
Not a researcher
Acta 1770 (1), 130136
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
This process may support growth and improve metabolism, muscle development, and fat reduction, making it a compelling option for weight loss, albeit off-label
They both work by activating the GHRH receptors in the pituitary gland and stimulating pulsatile secretion of GH
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