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Magnesium Silicate
AKA “Ambosol, Silicic acid, magnesium salt, Magsorbent, Avibest, Britesorb, Gastomag, Magmasil, Naisuton, Novasorb, Salisil”
Ingredient
Ingredient Facts
Magnesium silicate
AKA: Ambosol, Silicic acid, Magnesium salt, Magsorbent, Avibest, Britesorb, Gastomag, Magmasil, Naisuton, Novasorb, Salisil
Ingredient · Absorbent · EWG: 1
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
See origin →
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
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Report on the Safety Assessment of Aluminum Silicate, Calcium Silicate, Magnesium Aluminum Silicate, Magnesium Silicate, Magnesium Trisilicate, Sodium Magnesium Silicate, Zirconium Silicate, Att
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
Calcium Magnesium Silicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Lithium Magnesium Silicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Magnesium Silicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Sodium Magnesium Silicate
European Commission
EU Cosmetic Ingredient Database (CosIng)
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Final report on the safety assessment of aluminum silicate, calcium silicate, magnesium aluminum silicate, magnesium silicate, magnesium trisilicate,
Elmore AR, Cosmetic Ingredient Review Expert Panel
International journal of toxicology, 2003
→
Lithium Magnesium Silicate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Magnesium Silicate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
Sodium Magnesium Silicate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
→
The preparation of lactoferrin/magnesium silicate lithium injectable hydrogel and application in promoting wound healing.
Wang B, Zhao J, Lu W, Ma Y, Wang X et al.
International journal of biological macromolecules, 2022
→
The preparation of lactoferrin/magnesium silicate lithium injectable hydrogel and application in promoting wound healing.
Wang B, Zhao J, Lu W, Ma Y, Wang X et al.
International journal of biological macromolecules, 2022
→
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR