Magnesium Sulfate — Allergy Risk & Safety Profile
INCI: MAGNESIUM SULFATE
Key Facts
- CAS Number
- 7487-88-9
- Category
- filler
- Risk Level
- low
- Common Allergen
- No
- Found In
- bath salt
Is Magnesium Sulfate safe in cosmetics?
Magnesium Sulfate is rated low risk in cosmetic products. It is not classified as a common allergen and is generally well-tolerated by most skin types. Commonly found in bath salt.
What is Magnesium Sulfate?
Epsom salt. Used in bath products for muscle relaxation.
Allergy & Safety Information
Magnesium Sulfate is considered safe for cosmetic use at typical concentrations.
This ingredient is considered low risk from an allergenicity perspective. Reactions are uncommon at typical cosmetic use concentrations. However, no ingredient is universally safe — if you notice redness, itching, or irritation after using a product containing this ingredient, discontinue use and monitor whether symptoms resolve.
How to Identify Magnesium Sulfate in Products
Cosmetic ingredients are listed by their INCI (International Nomenclature of Cosmetic Ingredients) name in descending order of concentration. To check whether a product contains Magnesium Sulfate, scan the ingredient list for its INCI name exactly as it appears above. Ingredients present at 1% or less may appear in any order after the 1% threshold.
Product types to prioritise checking: Bath salt. These product categories are the most common sources of Magnesium Sulfate exposure based on formulation data.
Not sure if your products contain Magnesium Sulfate? Paste the ingredient list into the free ingredient checker to scan for Magnesium Sulfate and other allergens automatically.
Frequently Asked Questions
Is Magnesium Sulfate safe for sensitive skin?
Magnesium Sulfate is generally well-tolerated, even by sensitive skin.
What products contain Magnesium Sulfate?
Magnesium Sulfate is commonly found in bath salt.
What does Magnesium Sulfate do in cosmetics?
Magnesium Sulfate functions as a filler in formulations.
Related Guides
Is Magnesium Sulfate causing YOUR skin reactions?
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