Is aluminum in antiperspirant safe?

Aluminum salts are used as the active antiperspirant ingredient. Published reviews from the FDA and CIR confirm that aluminum at typical antiperspirant use levels is recognized as safe; the Alzheimer's link has been studied and is not supported by published evidence.

Why is aluminum used in deodorants?

Aluminum salts block sweat production by temporarily plugging sweat ducts. This is the mechanism that makes antiperspirants work; alternatives haven't proven as effective in published testing.

active

Aluminum Sesquichlorohydrate

Commonly feared, low concern·Strong evidence

An aluminum salt used in antiperspirant formulations to reduce perspiration. Regulatory review has not found evidence linking cosmetic antiperspirant aluminum salts to breast cancer or Alzheimer disease risk.

The myth vs the evidence

A persistent concern in consumer forums claims that antiperspirant aluminum causes breast cancer or Alzheimer disease. Regulatory agencies including the FDA and multiple epidemiological studies have found no causal link. The systemic exposure from topical antiperspirant use remains minimal.

Questions

Is aluminum in antiperspirant safe?: Aluminum salts are used as the active antiperspirant ingredient. Published reviews from the FDA and CIR confirm that aluminum at typical antiperspirant use levels is recognized as safe; the Alzheimer's link has been studied and is not supported by published evidence.
Why is aluminum used in deodorants?: Aluminum salts block sweat production by temporarily plugging sweat ducts. This is the mechanism that makes antiperspirants work; alternatives haven't proven as effective in published testing.

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.