Ingredient Guide

Sodium PCA

Also known as: Sodium pyrrolidone carboxylic acid, NMF component

All skin types

What It Is

The sodium salt of pyrrolidone carboxylic acid (PCA) — a key component of skin's Natural Moisturizing Factor (NMF). Naturally produced by the skin to maintain hydration.

What It Does

Acts as a powerful humectant that draws moisture to the skin. Because it's skin-identical, it integrates seamlessly with the skin's own hydration mechanisms.

Best For

DehydrationBarrier supportNormal and dry skin

Benefits

  • Skin-identical humectant — directly mirrors what skin produces naturally
  • More effective humectant per molecule than glycerin in some studies
  • Supports the skin's Natural Moisturizing Factor (NMF)
  • Non-irritating and universally tolerated

When to Be Careful

  • Often overshadowed by more marketed humectants like HA
ItGirlies Ingredient Intelligence
Why This Gets Hype

The Ordinary's Natural Moisturizing Factors + HA put NMF ingredients including sodium PCA in the spotlight. Skincare enthusiasts appreciated the skin-identical science behind it.

What People Often Misunderstand

Often grouped into the generic "humectant" category alongside glycerin and HA without recognizing that its skin-identical status makes it particularly effective for supporting the skin's own moisturizing system.

Best Routine Slot

Part of serums or moisturizers — hydration step. After cleansing and before heavier creams.

Good Match For

All skin types, especially dehydrated skin and anyone looking to support their Natural Moisturizing Factor.

Proceed Carefully If…

No concerns — extremely gentle and well tolerated.

Signs You May Be Overdoing It

Not applicable.

Commonly Found In

SerumsMoisturizersExfoliating toners (NMF balance)

Products Containing Sodium PCA

Glycolic Acid 7% Exfoliating Toner
The Ordinary
Natural Moisturizing Factors + HA
The Ordinary
Rice Lipids + Ectoin Microemulsion
The Ordinary
Natural Moisturizing Factors + PhytoCeramides
The Ordinary

FAQs About Sodium PCA

What is sodium PCA?
It's the sodium salt form of PCA (pyrrolidone carboxylic acid) — a natural component of skin's moisture-retaining system. In skincare, it acts as an effective humectant that works in harmony with how skin naturally hydrates.
Is sodium PCA better than hyaluronic acid?
Both are excellent humectants. Sodium PCA is skin-identical and supports the NMF; HA is well-known for its high water-holding capacity. Most great moisturizers include both.
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