Is Magnesium Silicate safe in cosmetics?
Magnesium Silicate has a safety rating of "MODERATE" in our database. EU status: prohibited. US status: permitted.
Moderate
Cosmetic Ingredient
Magnesium Silicate
Also known as: Florisil, Silicic acid, magnesium salt, Silicic acid magnesium salt, Britesorb No. 40, Caswell No. 533 (+3 more)
INCI: MAGNESIUM SILICATE
Magnesium Silicate (CAS 1343-88-0) is a cosmetic cosmetic ingredient functioning as Absorbent, anticaking, bulking, opacifying, viscosity controlling. NOAEL 266667 mg/kg bw/day (cross-referenced against ToxValDB ECHA IUCLID); EU Regulation 1223/2009 status: prohibited. Industrial safety data is also available in the chemical safety database. Same-CAS public records also appear in industrial chemical safety data.
View industrial chemical safety profile for CAS 1343-88-0 →
Auto-generated CPSR Part A draft with source citations
Cross-Vertical Regulatory Divergence
Magnesium Silicate is prohibited in EU cosmetics but has active industrial GHS classifications (H318, H319).
Source: Cosmetics: ingredients.eu_status; Chemicals: ghs_classifications.signal_word/hazard_statement_code
Function
Absorbent, anticaking, bulking, opacifying, viscosity controlling
Safety Rating
MODERATE
Chemistry & Identifiers
IUPAC Name
magnesium;tris(oxygen(2-));silicon(4+)
InChIKey
ZADYMNAVLSWLEQ-UHFFFAOYSA-N
Regulatory Status
EU EU Status
prohibited
US US Status
permitted
US Notes
Allowed - listed in the VCPA (Voluntary Cosmetic Product Ingredient) database; also used in pharmaceuticals and food (GRAS)
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Magnesium Silicate.
Calculate MoS for your specific formulation with the MoS Calculator.
Pre-Calculated Safety Assessment
Pre-calculated NOAEL → SED → MoS audit trail for Magnesium Silicate across SCCS product categories, with measured dermal absorption where available.
Additional Ingredient Properties
1 property record from structured ingredient metadata.
deodorant
{"cas_number": "1343-88-0", "ingredient_class": "sweat_absorber", "mechanism_of_action": "odor_absorption", "antiperspirant_efficacy_sweat_reduction_pct": "0", "deodorant_efficacy_hours": "8-12", "odor_reduction_pct": "30-50", "bacteriostatic": "no", "bactericidal": "no", "microbiome_impact": "neutral", "axillary_microbiome_effect": "varies by ingredient", "MIC_value_if_antimicrobial": "varies", "…
Function Categories & List Membership
Cosmetic/Chemical Function Categories
Absorbent
Anti-adhesive/cohesive
Anti-caking agent
Conductive agent
Filler
Opacifer
Processing aids not otherwise specified
Thickening agent
Viscosity modifier
Regulatory List Membership (1)
FDA Substances Added to Food (EAFUS)
Expert Verdict
Expert safety assessment and concern-level summary for Magnesium Silicate.
Regulatory Flags
fda_food_additive
Known Synonyms
Florisil
Silicic acid, magnesium salt
Silicic acid magnesium salt
Britesorb No. 40
Caswell No. 533
EINECS 215-681-1
EPA Pesticide Chemical Code 072601
UNII-9B9691B2N9
Chemical Function
Absorbent
Viscosity modifier
Opacifer
Filler
Anti-caking agent
Anti-adhesive/cohesive
Regulatory Lists
drinking_water; Europe; manufacturing; plastic_additive
inert_ingredient; non_food_use; Pesticides
inert_ingredient; non_food_use; Pesticides
Europe; Home maintenance - caulk/sealant
food_additive; Substances Added to Food (formerly EAFUS) (2/2019)
Canada; pharmaceutical
inert_ingredient; Pesticides
Australian Status
AICIS status: listed
Frequently Asked Questions
Is Magnesium Silicate allowed in the EU?
Magnesium Silicate EU regulatory status: prohibited. This is based on EU Regulation 1223/2009 and its amendments.
What does Magnesium Silicate do in cosmetics?
Magnesium Silicate functions as: Absorbent, anticaking, bulking, opacifying, viscosity controlling. It is classified as a cosmetic ingredient in our database. CAS number: 1343-88-0.
Is Magnesium Silicate used outside cosmetics?
Magnesium Silicate also appears in industrial chemical safety data. The cross-vertical cards on this page render same-CAS public rows from the matched databases.
Does Magnesium Silicate have different safety status in cosmetics vs industrial chemicals?
Magnesium Silicate is prohibited in EU cosmetics but has active industrial GHS classifications (H318, H319).
Compliance Tools
Check Magnesium Silicate compliance across multiple jurisdictions:
Ingredient Decoder
Paste a full ingredient list for instant analysis
82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
Compare limits across jurisdictions
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