Glutathione vs Collagen: Which One is Superior to Have Youthful Skin? DUOZI COLLAGEN +C SUPPLEMENT , BENEFITS : a beauty focused capsule designed to support skin whitening, anti aging, and overall vitality. It combines collagen peptides with vitamin C (and often L glutathione, collagen, and ascorbic acid (Vitamin C) are ingredients in Gluta Glow Powder, which is designed to promote healthy looking, youthful, and fairer looking skin. Tyrosinase enzyme activity is inhibited by glutathione, which thereby Amazon.com: AFC Japan Collagen White Beauty with Marine Collagen Peptide, Glutathione, L Cystine 1.5X Better Absorption Than Other Collagen Supports Skin Firmness & Radiance 90 Days Supply 270 Caplets : Health & Household