SALT EPSOM

Bulk Epsom Salts for Cosmetic Formulation

Epsom salts are a classic mineral ingredient in bath and body care cosmetics, valued for their exfoliating action and relaxing sensory effect on skin. Royal Bio supplies this compound in bulk to cosmetic laboratories, artisan soap makers and professional formulators across Europe. This guide covers what Epsom salts are, where they come from, and their main applications in finished cosmetic products.

What are Epsom salts?

Epsom salts are a mineral compound made of magnesium and sulfate, with the chemical formula MgSO4. They appear as odorless white crystals that dissolve readily in water, which makes them easy to incorporate into aqueous formulations or dry blends for bath products.

In cosmetics, they are valued mainly for two properties: mechanical exfoliation from their crystalline texture, and the relaxing sensory effect perceived when dissolved in warm water. These characteristics make them a common ingredient in bath salts, body scrubs and spa products formulated by laboratories and soap makers.

Cosmetic uses of Epsom salts

Relaxing bath salts. This is the most widespread use: dissolved in warm water, Epsom salts create a relaxing sensory experience and blend easily with essential oils, botanical extracts or cosmetic colorants to build differentiated spa formulations.

Body scrubs. Their crystalline texture supports mechanical exfoliant formulas, often paired with vegetable oils or emollient butters that Royal Bio also supplies in bulk, achieving a balanced texture between abrasion and slip.

Bath bombs and effervescent solid products. They are used as part of the mineral phase in bath bombs and other solid bath products, adding volume, visible crystalline texture and compatibility with baking soda and citric acid.

Formulations for artisan soap makers. Many soap makers use Epsom salts in bath soaps with visible exfoliating particles or in combination with sea salts, taking advantage of bulk availability and storage stability.

CAS: 7487-88-9; 10034-99-8 (heptahydrate); 18939-43-0. EINECS: 231-298-2. INCI: Magnesium sulfate.