Magnesium Ascorbyl Phosphate is a water-soluble vitamin C derivative. Similar to Sodium Ascorbyl Phosphate, it works best in a water-based formula with a ph around 7, higher than the ph of healthy skin which is around 5.5.
The antioxidant properties of Magnesium Ascorbyl Phosphate is far below L-ascorbic acid, however, it has a significantly longer shelf life. Although it is still prone to oxidation in contact with the oxygen atom of the water molecule (H2 O), Magnesium Ascorbyl Phosphate is more stable than L-ascorbic acid and Sodium Ascorbyl Phosphate.
Magnesium Ascorbyl Phosphate Reduces Acne Inflammation
Numerous studies showed that Magnesium Ascorbyl Phosphate has anti-inflammatory properties. Like Sodium Ascorbyl Phosphate, it can help reduce acne inflammation without causing excessive skin dryness. Some studies also suggested that both vitamin C derivatives may be used to improve the general appearance of skin.
Based on my experience in formulating skincare products for blemished skin, Salicylic Acid provides better results in treating blemished skin than both Sodium and Magnesium Ascorbyl Phosphate. A clinical study showed that at concentration between 0.5% and 2%, Salicylic Acid reduced the number and severity of acne lessions. It is effective at clearing up blocked pores and calming down acne inflammation.
One of my formulas for acne-prone skin, Blemish Clearing Serum contains 2% Salicylic Acid. It also contains allantoin, barberry bark extract, vetivert, rosewood and grapefruit essential oil to clear up blemishes, restore radiance and help prevent acne scars.
Salicylic Acid For Blemish-Free Skin. Read >>>
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Sources: Magnesium Ascorbyl Phosphate Regulates the Expression of Inflammatory Biomarkers in Cultured Sebocytes, Annals of Dermatology, 2015 Aug, 27(4): 376–382; Application of l-Ascorbic Acid and its Derivatives (Sodium Ascorbyl Phosphate and Magnesium Ascorbyl Phosphate) in Topical Cosmetic Formulations: Stability Studies, Journal of the Chemical Society of Pakistan, Vol. 35, No.4, 2013; Vitamin C in dermatology, Indian Dermatology Online Journal, 2013 Apr-Jun, 4(2): 143–146.