isomers glutathione serum Antioxidant – Skincare Laboratories Dermatology tested Glutathione Antioxidant Serum by Isomers

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

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I like to use this face serum at night

Tetrahexyldecyl Ascorbate is resistant to oxidation for up to 18 months

It also has an antiaging effect by increasing collagen synthesis, stabilizing collagen fibers, and decreasing collagen degradation