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For anti-aging and skin rejuvenation, peptides like thymosin beta-4 and GHK-Cu stimulate collagen production, reduce wrinkles, and improve skin elasticity
Sigma-Aldrich) and sulfosalicylic acid (Sigma-Aldrich) as previously described 90
In adults, offlabel use aims to restore agerelated declines in GH output, though robust adult trial data are limited and dosing is extrapolated from pediatric and physiologic studies [2]
One is what is in the injection, as some agents may work better for some patients than others