INCI Name
Magnesium Sulfate
Functions
3 Roles
Sustainability
9/10
Category
general
What It Does
Magnesium Sulfate, commonly known as Epsom salt, is an inorganic mineral compound naturally found in seawater and mineral deposits. In cosmetic formulations, it serves multiple purposes: as a viscosity modifier in aqueous systems, a source of magnesium ions for skin conditioning, and for its astringent properties that help tighten and tone skin. Formulators particularly value it in bath products, foot soaks, and exfoliating formulations for its ability to draw out impurities, reduce inflammation, and provide a temporary firming effect on skin.
Technical Properties
pH Range
5.5-7.0
Optimal working range
Ionic Charge
anionic
Molecular charge type
Viscosity Effect
thickening
Impact on formula thickness
Molecular Profile
Molecular Weight
120.37
g/mol
H-Bond Donors
0
Hydrogen bond donor count
H-Bond Acceptors
4
Hydrogen bond acceptor count
Polar Surface Area
88.6
Angstroms squared
Ingredient Compatibility
Known Interactions
Calcium and Magnesium compete for absorption at high doses. While they can be combined at moderate levels, high-dose formulations should separate them or use chelated forms.
Sustainability Profile
Sustainability Score
Biodegradability
readily biodegradable
Source
mineral
Feedstock
naturally occurring mineral deposits or seawater extraction
Related Ingredients
Similar viscosity modifiers to explore
Quick Reference
- Full INCI Name
- Magnesium Sulfate
- Common Name
- Epsom Salt
- CAS Number
- 7487-88-9
- Category
- general