Ingredient dictionary

Magnesium Sulfate

Also listed as: Epsom Salt

Magnesium Sulfate is a mineral salt that combines magnesium with sulfate. In beauty products it mostly helps adjust thickness, and it is the key ingredient in Epsom salt bath soaks. It is on the label of 39 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Magnesium Sulfate does

Adjusts the thickness of shampoos and washes
Dissolves easily in warm bath water
Adds a classic mineral touch to bath soaks

Magnesium sulfate occurs naturally as the mineral epsomite, and it is also made for cosmetic and industrial use. The name Epsom salt comes from Epsom, a town in England where the salt was historically drawn from local springs.

Formulators use it mainly as a thickness adjuster, since it helps shampoos and body washes keep a steady, familiar texture. In bath soaks, it dissolves easily in warm water and is valued for a classic spa-style soak. It is a simple salt that rinses away cleanly and is a common choice in many product types.

Good for

Suits people who enjoy a classic bath soak, and anyone who wants shampoos and body washes with a steady, controlled thickness.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is Magnesium Sulfate the same as Epsom salt?

Yes, in beauty products the two names usually refer to the same thing. Epsom salt is the common name for magnesium sulfate, the form most people know from bath soaks. Check the ingredient list if you want to see the exact name used on a product.

Does Magnesium Sulfate dry out skin or hair?

It is generally considered mild. Like most salts, it can feel slightly drying if a product stays on the skin for a long time or is used very often. Rinsing well after a bath or wash helps.