Magnesium Silicate
molecular structure · PubChem
AKA: Ambosol, Silicic acid, Magnesium salt, Magsorbent, Avibest, Britesorb, Gastomag, Magmasil, Naisuton, Novasorb, Salisil
Synthetic
Clean
Magnesium silicate is a compound of magnesium oxide and silicon. It is the magnesium salt of silicic acid containing an unspecified amount of water. The molecular formula can be expressed more clearly as MgSiO3.xH2O. It is known as talc and it presents many uses in the cosmetic industry, food industry and pharmaceutical industry. Under the FDA, magnesium silicate is determined as a member of the substances generally recognized as safe (GRAS) to be used as an anticaking agent.
Solubility Insoluble
Formula
MgO3Si
Mol. Weight
100.39
CAS #
1343-88-0
Form
Powder
State
Other Solid; Pellets or Large Crystals, Other Solid
Functions
Absorbent
Anticaking
Bulking
Opacifying
Viscosity Controlling
Absorbs Excess Oil
Prevents Clumping
Adds Body & Volume
Adds Opacity
Antioxidant Protection
Wound Healing
Fights Bacteria
Traditional Use
Used historically in traditional medicine and as a natural absorbent; commercially developed in the early 20th century for cosmetics. Functions as a dry powder, absorbent, and opacifying agent in pressed powders and dry formulations.
Skin Types
●all-skin-types
Best For
Oiliness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR