4 In another study evaluating topical glutathiones role on UV-induced erythema, Grandi et al 9 found that subjects pre-treated with S-acyl glutathione 2% cream, a linoleic acid pre-conjugate, had a significantly lower minimal erythema dose compared to placebo, indicating UV protective properties ( p =0.0003)
If you're using Hyaluronic Acid, it goes on before your moisturiser in the morning or evening
Vitamin C, for example, has dedicated transporters inside cell membranes that allow it to enter cells even though the concentration is higher inside the cell than outside
Vitamin C: Safe for daily use, typically in the morning
Dermatol Ther 33, e13312.CrossRefGoogle ScholarPubMed Sercombe, L, Veerati, T, Moheimani, F, et al