Researched by Helena DeMaria-Williams
Formula IngredientViscosity Controller/Emulsion StabiliserMagnesium Sulfate
INCI: Magnesium Sulfate
Magnesium sulfate (commonly known as Epsom salt) is an inorganic salt composed of magnesium and sulfate ions. In cosmetic formulations it functions as a bulking agent, viscosity controller, and emulsion stabiliser, particularly effective at stabilising water-in-oil (W/O) emulsions. In anhydrous formulations, it generates gentle heat when mixed with water, which is exploited in self-heating mask and cleanser products.
Category
Viscosity Controller/Emulsion Stabiliser
Irritation Risk
Low
Skin Types
all skin types, sensitive, oily, dry, combination
What does this do in a formula?
viscosity control, emulsion stabilisation, bulking agent, heat generation in anhydrous products, texture enhancement
Is Magnesium Sulfate safe? Key considerations
Can Magnesium Sulfate cause irritation?
Low RiskMagnesium sulfate is well tolerated at cosmetic concentrations. It has been used safely in bath products (Epsom salt baths) for centuries. No EU CosIng Annex II or III restrictions apply.
Does Magnesium Sulfate increase sun sensitivity?
No RiskMagnesium sulfate does not increase photosensitivity. No sun protection precautions are required.
Is Magnesium Sulfate safe during pregnancy?
SafeTopical magnesium sulfate in cosmetics is considered safe during pregnancy. Epsom salt baths are commonly used during pregnancy. No reproductive or developmental concerns are documented for topical cosmetic use at normal concentrations.
How does Magnesium Sulfate work?
Magnesium sulfate (commonly known as Epsom salt) is an inorganic salt composed of magnesium and sulfate ions. In cosmetic formulations it functions as a bulking agent, viscosity controller, and emulsion stabiliser, particularly effective at stabilising water-in-oil (W/O) emulsions. In anhydrous formulations, it generates gentle heat when mixed with water, which is exploited in self-heating mask and cleanser products.
Which products contain Magnesium Sulfate?
Shop products that contain Magnesium Sulfate
