Magnesium Ascorbyl Palmitate Good Antioxidant Anti-Ageing Hydration Magnesium Ascorbyl Palmitate description Fatty acid-based derivative of vitamin C that can be an effective antioxidant. Research shows this form of vitamin C is less stable than others such as magnesium ascorbyl phosphate, which is why we don’t rate it as highly as other forms of vitamin C. Related ingredients: Vitamin C