Injection site selection balances convenience with proximity to target tissues
Tucker, M., Liao, G., Park, J., Rosenfeld, M., Wezeman, J., Mangalindan, R., Ratner, D., Darvas, M., & Ladiges, W
doi:10.1002/9780470123058.ch3
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Because glutathione doesnt survive digestion well enough to enter cells effectively, its hard to get it directly from oral supplements or even your food
other important considerations include formulation technology, the efficiency of active ingredient delivery into the epidermis , and supporting ingredients like Azelaic Acid that help maintain the skin barrier