At week 12, women in the collagen group displayed significantly improved skin scores for wrinkle, elasticity, hydration, radiance, and firmness compared with placebo control values (via VISIA skin analysis system, Cutometer , and Skin Quality Visual Analogue Scale)
J Clin Invest 87:12001206 Tnshoff B, Kaskel FJ, Moore LC (1998) Effects of insulin-like growth factor I on the renal juxtamedullary microvasculature
Volotskova, O., Hawley, T
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See the Tirzepatide protocol page for the standalone reference
Free Radical Biology & Medicine, 27(9-10), 916-921