Vitamin C Vitamin C is considered an all-rounder. It improves the synthesis of microproteins and collagen in tissues. Vitamin C in skin care products protects the skin from cell-damaging free radicals - aggressive groups of molecules that accelerate the aging process. These can occur, for example, when sunlight penetrates the skin. Vitamin C intercepts these aggressive particles on the skin and defuses them. Vitamin E is also a radical scavenger. The combination of these two similar substances is interesting because vitamin C can help depleted vitamin E regain its cell protective function.