Vitamin C is the most powerful antioxidant of all vitamins that combat free radicals due to environmental aggression (sun, pollution, stress.) Vitamin C's role in the collagen synthesis improves elasticity and retextures skin by perfecting tone and pigmentation. Vitamin C loses 85% of its potency within one hour of opening the jar, Dr Sebagh Pure Vitamin C 20% emulsion powder cream patented is a revolutionary way to overcome the stability problem of Vitamin C.