Good Cosmetic Ingredient GHS Classified

Aluminum Hydroxide

INCI: ALUMINUM HYDROXIDE

CAS Number
21645-51-2
Function
Opacifying, Skin Protecting, Viscosity Controlling, Buffering, Pigment Coating
Safety Rating
GOOD

Regulatory Status

🇪🇺 EU Status permitted
EU Max Conc. Category-specific elemental aluminum limits per SCCS/1662/23
🇺🇸 US Status permitted
US Notes CIR concluded safe (2014). GRAS as direct food additive. OTC skin protectant at 0.15-5%. Approved substrate for aluminum lake colorants.

For full compliance data across 55 jurisdictions, use the Substance Compliance tool.

Safety Data

Margin of Safety (MoS)
adequate
Dermal Absorption
negligible
Sensitization
none

Calculate MoS for your specific formulation with the MoS Calculator.

GHS Hazard Classification

Globally Harmonized System classification per ECHA C&L inventory and ILO/WHO International Chemical Safety Cards.

Routes of Exposure
The substance can be absorbed into the body by inhalation.

Expert Verdict

Extensively evaluated by SCCS (latest opinion SCCS/1662/23 March 2024). Practically insoluble with negligible dermal penetration. Safe in non-sprayable products.

⚠️
Concern Level: Low

Regulatory Flags

fda_food_additive

Frequently Asked Questions

Is Aluminum Hydroxide safe in cosmetics?

Extensively evaluated by SCCS (latest opinion SCCS/1662/23 March 2024). Practically insoluble with negligible dermal penetration. Safe in non-sprayable products. The EU classifies Aluminum Hydroxide as "permitted". Safety rating: GOOD.

Is Aluminum Hydroxide allowed in the EU?

Aluminum Hydroxide EU regulatory status: permitted. Maximum allowed concentration: Category-specific elemental aluminum limits per SCCS/1662/23. This is based on EU Regulation 1223/2009 and its amendments.

What does Aluminum Hydroxide do in cosmetics?

Aluminum Hydroxide functions as: Opacifying, Skin Protecting, Viscosity Controlling, Buffering, Pigment Coating. It is classified as a cosmetic ingredient in our database. CAS number: 21645-51-2.

What is the Margin of Safety for Aluminum Hydroxide?

adequate The Margin of Safety (MoS) is calculated using SCCS methodology. A MoS above 100 is generally considered safe. Use the MoS Calculator tool to calculate MoS for your specific formulation and product category.

Compliance Tools

Check Aluminum Hydroxide compliance across multiple jurisdictions:

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Ingredient Decoder
Paste a full ingredient list for instant analysis
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82 Allergen Checker
Check for EU declarable fragrance allergens
 🧪
Substance Compliance
Check compliance across 55 jurisdictions
 🧮
MoS Calculator
Calculate Margin of Safety using SCCS methodology
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Heavy Metal Limits
Compare limits across jurisdictions

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