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Vitamin C contributes to the normal function of the immune system

doi: 10.1073/pnas.96.2.721 85 WuL.ZhouX.LiT.HeJ.LinX.HuangL.et al

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Bishop PN, Reardon AJ, McLeod D, Ayad S

Collagen peptides could activate the transforming growth factor-beta (TGF-)/Smad pathway and inhibit the expression of activator protein-1 (AP-1), matrix metalloproteinase-1 (MMP-1), MMP-3, and MMP-9 [34], thereby reducing collagen degradation and promoting collagen synthesis and the repair of photoaged skin cells

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