Ingredient Encyclopedia

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Discover what’s inside your skincare — from retinol to aloe vera — with clear guides on benefits, uses, and safety.

Ingredient Encyclopedia

Sodium PCA – Benefits, Side Effects & Uses

by ThankMeNow Editors on Sep 10, 2025
Sodium PCA (Sodium Pyrrolidone Carboxylate) is a high-performance humectant that serves as a cornerstone of your skin's Natural Moisturizing Factor (NMF). While most humectants are foreign molecules that attract water from the outside, Sodium PCA is "skin-identical"—it is already naturally present in your skin cells to maintain hydration and elasticity. It is exceptionally hygroscopic, meaning it can hold several times its weight in water, yet it possesses a unique, non-sticky finish that makes it superior to traditional glycerin for those who dislike a heavy feel. By replenishing the NMF, Sodium PCA doesn't just "wet" the surface; it restores the skin's internal ability to remain flexible and resilient against environmental stress.