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Some DIY beauty gurus address this issue by remaking the vitamin C serum weekly to ensure it is always fresh and delivers results

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

Like I just mentioned, I have a not-so-small list of effective anti-aging ingredients

Tetrahexyldecyl Ascorbate is resistant to oxidation for up to 18 months

I like to use this face serum at night