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Magnesium Ascorbyl Phosphate (MAP) — Stable Vitamin C Derivative

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Description

Magnesium Ascorbyl Phosphate (MAP) — Stable Vitamin C Derivative for Brightening & Anti-Aging

Magnesium Ascorbyl Phosphate (MAP) is a water-soluble, highly stable salt form of Vitamin C (ascorbic acid). Unlike L-Ascorbic Acid, which oxidizes rapidly and requires low pH formulations, MAP is stable across a wide pH range, non-irritating, and suitable for sensitive skin — making it one of the most formulator-friendly Vitamin C derivatives available.

Once absorbed into the skin, MAP is enzymatically converted to free ascorbic acid, delivering the full biological activity of Vitamin C: collagen synthesis stimulation, melanin inhibition, and antioxidant protection against UV-induced free radical damage.

MAP vs. Other Vitamin C Forms

	MAP (this product)	L-Ascorbic Acid	3-O-Ethyl Ascorbic Acid
Stability	Excellent — stable in water	Poor — oxidizes rapidly	Good — stable in water
pH of raw material	7.0–8.0	2.5–3.5	4.0–6.0
Solubility	Water-soluble	Water-soluble	Water & oil soluble
Skin Irritation	Very low — sensitive skin safe	Moderate to high	Low
Brightening	Strong — inhibits tyrosinase	Strong	Strong
Collagen support	Yes — via ascorbic acid conversion	Yes — direct	Yes — via conversion
Typical usage rate	1–10%	5–20%	1–3%

Key Benefits

Brightening & hyperpigmentation correction — inhibits tyrosinase, the key enzyme in melanin synthesis; reduces dark spots, uneven tone, and post-inflammatory hyperpigmentation
Collagen synthesis support — converted to ascorbic acid in skin, a required cofactor for collagen biosynthesis; supports skin firmness and elasticity
Antioxidant protection — neutralizes free radicals generated by UV exposure and environmental stress; helps prevent photoaging
Exceptional stability — does not yellow or oxidize like L-Ascorbic Acid; extends product shelf life
Sensitive skin compatible — non-irritating at effective concentrations; suitable for reactive, rosacea-prone, and post-procedure skin
Broad formulation versatility — works in serums, toners, moisturizers, eye creams, and masks

How to Use

Incorporation: Dissolve in the water phase. Stir into warm water (40–60°C) until fully dissolved. Can also be added at cool-down (below 40°C) with extended mixing
Recommended Usage Rate: 1–10% in finished formulations (3–5% most common for brightening serums; up to 10% for intensive treatment products)
Solubility: Freely water-soluble; not oil-soluble
pH of raw material: 7.0–8.0 (1% aqueous solution). Adjust finished formula pH to suit your target application
Processing temperature: Do not exceed 70°C

Formulation Details

INCI Name	Magnesium Ascorbyl Phosphate
CAS Number	113170-55-1
Appearance	White to off-white crystalline powder
Solubility	Freely water-soluble; not oil-soluble
Recommended Usage Rate	1–10% (3–5% typical)
pH of Raw Material	7.0–8.0 (1% aqueous solution)
Incorporation Phase	Water phase or cool-down (below 40°C)
Shelf Life	24 months, properly stored
Storage	Store at 10–25°C (50–77°F), in a sealed container away from light, heat, and humidity
Grade	Cosmetic Grade — External Use Only