Aluminium Hydroxide

ALU

8/10

Concern level

High concern

Inorganic aluminum hydroxide used in cosmetics primarily as an opacifying agent, skin protectant, viscosity modifier, and coating/stabilizing material—especially in mineral sunscreens and pigment dispersions. CIR reports it is safe in the present practices of use and concentration in cosmetics. ([pubchem.ncbi.nlm.nih.gov](https://pubchem.ncbi.nlm.nih.gov/compound/Aluminum-hydroxide?utm_source=openai))

Pore-clogging

Non-comedogenic

Pregnancy

Safe

Regulatory

No data

Benefits

Supports Barrier Function

Chemical Properties

Molecular Weight

78 g/mol

Typical Concentration

0.10% - 6.00%

CAS Number: 21645-51-2

Skin Type Compatibility

dry skin7/10

oily skin7/10

sensitive skin8/10

acne prone8/10

mature skin7/10

normal skin8/10

Interactions

incompatible with: No major topical interactions are established; in formulas, it is commonly used to coat titanium dioxide and other pigments. Avoid generating airborne dust in processing. ([incidecoder.com](https://incidecoder.com/ingredients/aluminum-hydroxide?activetab=details&utm_source=openai))

Risks & Warnings

Generally low risk in topical cosmetics, but fine powders can be mildly irritating to eyes, nose, and respiratory tract if inhaled. Avoid direct contact with eyes; use caution with aerosolized or loose-powder products. ([pubchem.ncbi.nlm.nih.gov](https://pubchem.ncbi.nlm.nih.gov/compound/Aluminum-hydroxide?utm_source=openai))

Vegan Cruelty-Free

Found In Products

indē wild