murphyAluminum Hydroxide
AKA: Hydrated alumina, Amphojel, Aluminum hydrate, Dried aluminium hydroxide, Dried, ALternaGEL, Aluminium hydroxide, Alu-Cap, Aluminum hydroxide gel, Aluminium hydroxide gel
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Synthetic
Synthetic
Clean
OriginDerived from bauxite ore, a mineral source containing aluminum compounds found globally in tropical regions. Produced through the Bayer process, which extracts aluminum oxide from bauxite and chemically converts it to aluminum hydroxide through hydration.
Aluminium hydroxide is the most stable form of aluminium. It is found in nature as the mineral gibbsite (also known as hydrargillite) and its three, much more rare, polymorphs: bayerite, doyleite and nordstrandite. Aluminum hydroxide is used as an antacid and included as an adjuvant in some vaccines. Aluminum is the most abundant metal in the earth's crust and is always found combined with other elements such as oxygen, silicon, and fluorine. (L739, L740, L756)
Solubility Insoluble in water; soluble in alkaline solutions, acid solutions
Formula
AlH3O3
Mol. Weight
78.00
CAS #
21645-51-2
Form
Powder
State
White solid in various forms; [ICSC] White odorless granules; Slightly soluble in water; [MSDSonline]
Skin Types
●all-skin-types
Best For
General
Functions
Buffering
Draws water to skin
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not a Skin Irritant
1 study / 1 not irritating (CIR 643)
Concentration Guide
Leave-on0.0000008–10.1%
Rinse-off0.0022–8.8%
0%50%100%
Reg. limit 5%
CIR reported use · 2013 survey
FDA OTC limit (Skin Protectant): 5%. 21 CFR 347.10
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR