Best For Skin Types
All, Dry, Combination, Sensitive
Addresses
Usage Frequency
Daily
What Is Magnesium PCA?
Magnesium PCA is the magnesium salt of pyrrolidone carboxylic acid (PCA), a naturally occurring compound found in skin. It functions as a humectant and skin conditioning agent, meaning it draws moisture into the skin and helps maintain hydration levels.
PCA is part of the skin's natural moisturising factor—the combination of compounds that keeps skin supple and hydrated. In skincare formulations, magnesium PCA works to support the skin's ability to absorb and retain water.
Benefits for Your Skin
How It Works
Magnesium PCA works as a humectant by attracting water molecules from the environment and deeper skin layers, drawing them to the outer layers of the skin. This helps maintain hydration and prevents transepidermal water loss.
The magnesium component may also contribute to skin conditioning benefits, though the majority of its functional role in cosmetics centres on its humectant properties.
Clinical Evidence & References
Magnesium PCA has been assessed for safety by the Cosmetic Ingredient Review Expert Panel and confirmed as safe for use in cosmetics at current concentrations. The ingredient is recognised as a legitimate skin conditioning agent and humectant.
However, specific clinical studies demonstrating its hydrating efficacy in human skin remain limited. It is used in approximately 0.2% of skincare products, suggesting its adoption in formulations is relatively modest compared to other humectants.
Published Research
How to Use
Magnesium PCA is typically found in serums, moisturisers, and hydrating toners. For best results, apply to damp skin to maximise its water-binding capacity, then follow with an occlusive moisturiser to seal in hydration. It works well alongside other humectants and can be used daily.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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