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

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

It is considered to be slightly weaker than ascorbic acid, but it is way more reliable and does not cause skin irritation (unlike ascorbic acid)

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

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