Aluminium salts are the active ingredient in antiperspirants — they work by physically blocking sweat glands. Concerns centre on systemic absorption through underarm skin, particularly where skin is damaged by shaving, and on a proposed association with breast cancer and Alzheimer's disease. The evidence for both associations remains contested and below the threshold for regulatory action, but accumulation in breast tissue has been documented.
Where it's found
Roll-on and stick antiperspirants, antiperspirant-deodorant combination products, some clinical-strength prescription antiperspirants. Aluminium also enters food from cookware, foil wrapping, and some processed foods including baked goods using aluminium-containing baking powder.
Routes of exposure
Dermal absorption through intact underarm skin (demonstrated but low); significantly increased absorption through recently shaved or damaged skin; oral ingestion from food contact and some food additives (E173, E520–E523).
Health concerns
Proposed weak oestrogenic activity of aluminium salts — metalloestrogen hypothesis remains scientifically debated. Aluminium detected in breast tissue and breast tumour biopsies in concentrations higher than in other tissues, but causal significance is disputed. High systemic aluminium is a confirmed neurotoxin linked to dialysis dementia in renal patients — but normal dietary and antiperspirant exposure is far below this level. The IARC has not classified antiperspirant aluminium. Cumulative exposure from all sources (food, cookware, cosmetics) merits consideration.
Evidence
SCCS (EU Scientific Committee on Consumer Safety) concluded in 2020 that aluminium in cosmetics including antiperspirants presents a potential concern and recommended reducing the maximum permitted concentration. EU has been reviewing limits. UK MHRA has not taken specific action. No ban or restriction in place in UK, EU or US. The proposed breast cancer link has not been established in large epidemiological studies, but the mechanistic evidence for absorption and accumulation is not disputed.
Who's most at risk
People who shave the underarm area regularly (significantly increased absorption), individuals with kidney disease (reduced ability to excrete aluminium), people with high overall aluminium dietary exposure.
Regulatory status
RegulationEU: SCCS review recommended reduction of concentration limits in cosmetics; regulatory change pending. UK MHRA: no specific action. US FDA: classified as over-the-counter drug; no specific aluminium restriction in antiperspirants.
How to reduce your exposure
Switch to a deodorant (not antiperspirant) — deodorants address odour without blocking sweat glands, typically using antibacterial agents or absorbents. Apply antiperspirant to intact skin only — avoid using directly after shaving. Reduce dietary aluminium exposure by avoiding aluminium foil for cooking acidic foods, and checking baking powder ingredients.
The nutrition connection
Aluminium competes with magnesium for absorption pathways and may interfere with magnesium's role in over 300 enzymatic reactions. Magnesium deficiency is already widespread — any factor reducing its absorption is worth minimising. The cookware and food-additive routes to aluminium exposure are directly relevant to Nutriofia's cooking and food preparation content.