★What is the difference between Magnesium Ascorbyl Phosphate (MAP) and L-Ascorbic Acid (pure Vitamin C)?
L-Ascorbic Acid is highly effective but very unstable — it rapidly oxidizes (turns yellow/brown) in water, especially at high pH or in the presence of light/air. MAP is a stable, water-soluble derivative that converts to Vitamin C on the skin after enzymatic hydrolysis. It is non-irritating, does not cause stinging, and remains active for much longer in formulations. However, MAP is slightly less potent than pure VC on a molar basis, but its stability and gentleness make it preferred for sensitive skin and long-shelf-life products.
★Is Magnesium Ascorbyl Phosphate stable in water-based formulations? What pH range is best?
Yes, MAP is exceptionally stable compared to L-ascorbic acid. It remains stable at pH 5.0–7.0 (optimal 6.0–7.0). Avoid highly acidic conditions (pH <4.0) or highly alkaline (pH >8.0), as the phosphate ester bond may hydrolyze. It does not require special antioxidants or chelators for stability, though standard preservatives are recommended.
★Is Magnesium Ascorbyl Phosphate water-soluble or oil-soluble? How to incorporate it?
Magnesium Ascorbyl Phosphate is water-soluble. It dissolves readily in water, glycols, and glycerin. It is practically insoluble in oils. To incorporate: simply add MAP to the water phase at room temperature or with gentle heating (<60°C). Avoid excessive heat (>80°C) to prevent hydrolysis.
★What is the appearance and purity of your Magnesium Ascorbyl Phosphate?
It appears as white or off-white powder, with purity ≥ 98%, low impurity and stable batch consistency.
★Is Magnesium Ascorbyl Phosphate water-soluble or oil-soluble?
Magnesium Ascorbyl Phosphate is excellent water-soluble, easy to add in water-phase formulas such as essences, toners and emulsions.
★What skincare products is Magnesium Ascorbyl Phosphate suitable for?
Brightening essences, whitening toners, day creams, sun repair products, firming serums, sensitive skin brightening products and masks.
★What is the recommended usage rate of Magnesium Ascorbyl Phosphate?
Recommended addition concentration: 1%–5%, can be adjusted according to product efficacy positioning.
★What pH range is suitable for Magnesium Ascorbyl Phosphate?
MAP is stable in pH 6.0–8.0, more stable in neutral to slightly alkaline environments.
★Is Magnesium Ascorbyl Phosphate approved for cosmetic use in the EU, USA, and China?
EU: Listed in CosIng as a permitted cosmetic ingredient with no concentration restriction (typical use 0.5-5%).
USA: Allowed; generally recognized as safe (GRAS) for topical use.
China (NMPA): Listed in IECIC 2021 (INCI: Magnesium Ascorbyl Phosphate) with no maximum concentration specified, but typical use ≤5%.
We provide full registration documents including COA, MSDS, TDS, and China compliance declaration.
★Can Magnesium Ascorbyl Phosphate be combined with other active ingredients (niacinamide, retinol, AHAs)?
Yes, MAP is highly compatible with most ingredients.
With niacinamide: Excellent synergy for whitening and anti-aging. Both are stable at pH 6-7.
With retinol: Yes, but add antioxidants to protect retinol.
With AHAs (glycolic, lactic): Avoid if final pH <4.0 (MAP may hydrolyze). Use at pH >5.0.
With peptides: Yes, MAP does not degrade peptides.
We recommend testing compatibility at your target pH.
