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Formula: C5H7NO3 Molecular Weight: 129.11 Cas No:98-79-3; 149-87-1
Chemical formula
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吡咯烷酮羧酸是存於皮膚角質層的自然保濕成份NMF (Natural Moisturizing factor )當中保濕性最強的。

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PCA stands for Pyrrolidone Carboxylic Acid and though it might not sound like it, it is a thing that can be found naturally in our skin. In fact, after amino acids, it is the second biggest NMF component of the skin with 12% being PCA of the NMF composition of normal skin. So similar to other NMFs, it's a skin goodie that helps the skin to hold onto water and stay nicely hydrated.

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