Magnesium PCA
A magnesium salt of pyrrolidone carboxylic acid. It draws and holds water in skin, part of the natural moisturizing factor. Well tolerated.
Evidence by route
Topical application
A functional humectant. Safe.
- CIR Cosmetic Ingredient Review safety assessment
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
Magnesium PCA (INCI: Magnesium PCA) is the magnesium salt of pyrrolidone carboxylic acid, a molecule that belongs to the skin's natural moisturizing factor. In a formula it draws water into the stratum corneum and helps hold it there, so it acts mainly as a humectant. On efficacy, treat it as a supporting ingredient rather than a hero active. The PCA fraction hydrates reliably and magnesium supplies the cation, but on its own it will not deliver anti-aging or barrier-repair effects. It performs best alongside other humectants and emollients. Applied topically it has no meaningful systemic absorption, so it is fine to use during pregnancy and breastfeeding. Tolerance is high. Irritation and allergy potential are low, it suits sensitive skin and does not clog pores. A convenient pick for lightweight daily hydration textures.
Frequently asked questions
Is Magnesium PCA safe during pregnancy?
Magnesium PCA is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Magnesium PCA for?
Magnesium PCA suits: normal, dry, combination, oily, sensitive.
What is Magnesium PCA and what does it do in cosmetics?
A magnesium salt of pyrrolidone carboxylic acid.
What's the INCI name for Magnesium PCA?
The INCI name is Magnesium PCA.
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