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3.3.2 Experimental summary 3.3.2.1 Basic characteristics of the included studies The key characteristics of the nine included studies are summarized in Table 2

However, it does suppress endogenous IGF-1 signaling and affects the GH axis

da Silva Toscano GA, de Arajo II, de Souza TA, Mirabal IR, de Vasconcelos Torres G

Because B12 absorption declines with age, stress, gut issues, and certain medications, injections are often recommended when oral supplementation is no longer effective

When formulated correctly in a suitable carrier cream or serum, GHK-Cu can penetrate the stratum corneum (the outer layer of skin) and establish a reservoir in the epidermis and dermis

These findings position the compound as a valuable research tool for investigating whether NNMT modulation influences age-associated metabolic changes in mammalian aging models
