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In this study, vegan collagen (VC) was used and administered daily at 5 g versus fish collagen (FC) at 5 g for 8 weeks in 90 subjects divided into the placebo group ( n = 30), VC ( n = 30), and FC ( n = 30), and skin parameters were measured at baseline, week 4, and week 8, which included skin collagen density, elasticity, wrinkles, texture, hydration, and pore size

10.1046/j.1365-2443.2001.00469.x 37 KatsuokaF.MotohashiH.IshiiT.AburataniH.EngelJ

If you experience no irritation after a week, you can increase to twice daily

A lower pool of this antioxidant may lead to more oxidative damage in the skin and can contribute to dullness or uneven tone