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Evening application provides the structural repair and regeneration that works in synergy with your skin's nighttime collagen synthesis cycle the most productive window for periocular rebuilding

Moon HK, Lee SH, Choi HC

This comes from stability data on the FDA-approved formulation of tirzepatide (Mounjaro and Zepbound), which compounding pharmacies use as a reference point for their own formulations

3 The results: + GHK-Cu increased collagen in 70% of women treated + Vitamin C cream increased collagen in 50% of women + Retinoic acid increased collagen in 40% of women This is one of the few studies that put three gold-standard anti-aging ingredients side by side and GHK-Cu outperformed both

So, is one superior to the other