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doi: 10.1016/S0891-5849(02)01001-8 226 ShiY.YamadaK.LiddelowS

Sources Unlike plants and most animals, humans have lost the ability to synthesize vitamin C endogenously and therefore have an essential dietary requirement for this vitamin (see The Recommended Dietary Allowance)

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They will assess your skin type, concerns, and suitability for the injection

Authorship note: XYL and GXW contributed equally to this work