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PCA

PCA (which stands for pyrrolidone carboxylic acid), is an ingredient derived from amino acids that serves as a humectant and is part of the natural moisturizing factor.

References for this information:
International Journal of Cosmetic Science,, February 2017, pages 2-10, and December 2016, pages 567-575
Journal of Dermatological Science, December 2014, pages 231-239

See natural moisturizing factor (NMF)

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