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(1) Aluminum Association, 900 19th St., NW, 20006 Washington, DC, USA
Abstract Aluminum is the third most abundant element in nature, accounting for nearly 8% of the Earth's crust. Because of its chemical activity, aluminum is not found naturally in its ldquofreerdquo, or metallic, state. However, in its ionic or combined forms, aluminum is a truly ubiquitous element.
Because of the widespread use of metallic aluminum in cooking and packaging applications, the Aluminum Association has funded critical reviews of the world's literature on the health effects of aluminum and aluminum compounds for the past 30 years.
More recently, an extensive research and literature surveillance effort was developed to provide information on the neurological implications of aluminum, dietary intakes and body balance, and analytical capabilities. Based on these efforts the following conclusions can presently be drawn: (1) the cause (or causes) of Alzheimer's disease is not known; (2) the biological significance of aluminum found in the brain is not understood; (3) aluminum is poorly absorbed by the body; and (4) the normal ingestion of aluminum from food and water should have no adverse effects on human health. 
...areas with high amounts of aluminium in the drinking water – probably due to water treatment – are showing an increase in the incidence of Alzheimer's disease.
Aluminium is also implicated in hyperactivity and learning disorders in children.
The manufacturer's safety data sheet states "no toxicological data available" for aluminium chlorohydrate itself, indicating that its safety has not been tested.
Propylene glycol appears as a major ingredient in many stick deodorants – including several 'natural' brands.... A published clinical review by the American Academy of Dermatology showed that propylene glycol causes a significant number of reactions and is a primary irritant to the skin even in low levels of concentration. 
The report, published in the Journal of Inorganic Biochemistry, goes on: “We have confirmed the presence of aluminium in breast tissue and its possible regional distribution within the breast. Higher content of aluminium in the outer breast might be explained by this region’s closer proximity to the underarm where the highest density of application of antiperspirant could be assumed. There is evidence that skin is permeable to aluminium when applied as antiperspirant.
Aluminum toxicity has been recognized in many settings where exposure is heavy or prolonged, where renal function is limited, or where apreviously accumulated bone burden is released in stress or illness. Toxicity may include: encephalopathy (stuttering, gait disturbance, myoclonic jerks, seizures, coma, abnormal EEG) osteomalacia or aplastic bone disease ( associated with painful spontaneous fractures, hypercalcemia, tumorous calcinosis ) proximal myopathy, increased risk of infection, increased left ventricular mass and decreased myocardial function microcytic anemia with very high levels, sudden death.