Aluminium neurotoxicity
Aluminium, present most often in antiperspirants, but not usually present in non-antiperspirant deodorants, has been established as a neurotoxin in very high doses. At high doses, aluminum itself adversely affects the blood-brain barrier, it is capable of causing DNA damage, and has adverse epigenetic effects. Research has shown that high doses of the aluminum salts used in antiperspirants have detrimental effects to a number of species such as non-human primates, mice, dogs and others. An increased amount of aluminum is also present in the brains of many Alzheimer's patients, although this link does not seem to be causal.
