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What to look for in a vitamin C serum Form: L-ascorbic acid Concentration: 10% to 20% Ingredient combo: L-ascorbic acid, tocopherol (vitamin E) or glutathione, ferulic acid Packaging: dark or tinted glass bottles with airless delivery Price: not a factor in quality, but opt for the brand that fits your budget Form Vitamin C can appear on the ingredients label under several different names, but the one you want is L-ascorbic acid, which is the most studied and effective
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If you feel tired all the time, even after a full nights rest, it may be due to low B12 levels
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