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Most recipes, as expected, use ascorbic acid, because it is the most well known form of vitamin C

DIY Anti-aging Face Serum With Vitamin C & CoQ10 This simple face serum recipe is formulated to even out a skin tone and provide anti-aging effects, such as cell regeneration and reduced appearance of wrinkles

Ingredients aka why this DIY face serum has anti-aging properties

For a quick summary, see this quote from one study : RESULTS: As one of the most powerful antioxidants in the skin, vitamin C has been shown to protect against photoaging, ultraviolet-induced immunosuppression, and photocarcinogenesis

Promotes a smoother skin surface, addressing unevenness and signs of aging

I try to add it to most of my oil-based formulations