Vitamin C is an umbrella term for a category of molecules. Ascorbic acid is pure Vitamin C. There are also multiple Vitamin C derivates used in skincare. It is one of the most popular anti-aging skin ingredients in Dermatology today. It helps neutralize free radicals and visibly brightens and tones the appearance of skin. goPure uses multiple stable and non-irrtating forms of Vitamin C. It can be used day and night and adds a preventative and restorative synergy to our skin care routine.