Common Name(s): Ach,aluminium chlorohydrate

CAS Number: 1327-41-9

DESCRIPTION

What It Does: Provides eccrine sweat gland occlusion for sweat and odour reduction.

Why It's Used: The global standard antiperspirant active with extensive safety assessment and reliable efficacy used by billions daily.

How It Works: Ach (al₂(oh)₅cl) hydrolyses in sweat to form aluminium hydroxide gel al(oh)₃. gel occludes upper eccrine duct lumen reducing sweat output by 20–40%. odour reduction from reduced moisture supporting bacterial growth. reversible — duct clears within days of cessation.

Typically Found In: Antiperspirant deodorants,roll-on,spray antiperspirants

TECHNICAL DETAILS

Primary Category: Active ingredient – antiperspirant

Secondary Functions: Skin conditioning

Application Areas:

Typical Concentration Range: 15%–25%

SOURCING & ETHICS

Vegan Status: Yes – synthetic

Halal Status: Yes

Source Notes: Commercially produced for cosmetic use. verify vegan/halal status with supplier.

SKIN COMPATIBILITY

Irritancy Rating: 1/5 – very low

Comedogenicity Rating: 0/5 – non-comedogenic

Sensitivity Concerns: Well-tolerated by most skin types.

Safe for Sensitive Skin: Yes

SAFETY & COMPATIBILITY

Safety Profile: Fda otc antiperspirant drug. sccs assessed safe. concerns about breast cancer and alzheimer's disease links are not supported by scientific evidence.

Works Well With: Standard skincare actives

Avoid Combining With: No known significant incompatibilities

SCIENTIFIC NOTE

Ach's antiperspirant mechanism creates a self-limiting occlusion: the sweat that triggers al(oh)₃ gel formation also stops further sweat from passing through the occluded duct — a self-regulating mechanism driven by the eccrine gland's own secretions.

Last Verified: Cosing database,fda otc antiperspirant monograph,sccs aluminum safety assessment

Primary Sources: 2026-03-12