It doesnt contain antimicrobial agents or preservatives
Intramuscular injection, by contrast, deposits peptide 1540mm deep (depending on needle length and injection site), requiring the compound to enter venous return, circulate systemically, and then diffuse back out of dermal capillaries to reach fibroblasts
Velmurugan K, Balamurugan AN, Loganathan G, Ahmad A, Hering BJ, Pugazhenthi S
23 Tissue Dysfunction: Senescent cells accumulate in various tissues as organisms age, including the skin, skeletal muscle, adipose tissue, liver, and vasculature
Better Blood Sugar Management Beyond weight loss, oral semaglutide is a powerful tool for managing blood sugar levels
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