Magnesium Ascorbate/PCA

Magnesium ascorbate/PCA is a derivative of vitamin C (ascorbic acid) combined with magnesium and pyrrolidone carboxylic acid (PCA). This combination makes vitamin C more stable than its pure form, allowing it to remain effective for longer in formulations without degrading as quickly when exposed to light and air.As an antioxidant, it helps neutralise free radicals—unstable molecules generated by UV exposure, pollution, and other environmental stressors that can damage skin cells and contribute to visible ageing.

Magnesium ascorbate/PCA works by donating electrons to unstable free radicals, neutralising them before they can damage skin cells. This process is called antioxidation. By reducing oxidative stress, the ingredient may help slow visible signs of ageing and support overall skin health.The addition of magnesium and PCA to vitamin C creates a more chemically stable molecule, meaning it degrades more slowly in product formulations—potentially offering more consistent antioxidant benefit over time.

Apply magnesium ascorbate/PCA products to clean, dry skin in the morning or evening. It pairs well with sunscreen during the day for enhanced environmental protection. Start with a lower frequency if your skin is sensitive, building up to daily use as tolerated. Store products containing this ingredient away from direct sunlight to help preserve stability.

Magnesium ascorbate/PCA is generally well-tolerated by most skin types. Those with sensitive skin or vitamin C sensitivities should patch test first, as some formulations may cause mild irritation.