Aluminum Hydroxide

Aluminum Hydroxide 1
Aluminum Hydroxide 2
Aluminum Hydroxide 3
Aluminum Hydroxide 4
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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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]
Functions
Buffering
Draws water to skin
EWG
1
CIR
Insufficient
Pregnancy
—
CIR Safety Findings
Not an Irritant
all-shades-safe
Concentration Guide
5.0%
0%7%
Reg. Limit
FDA OTC limit (Skin Protectant): 5%. 21 CFR 347.10
Regulatory Status
USAunder review
CANADA✔ permitted
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
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.
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Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR