Aluminium jumped right at me. Let me just explain what this most abundant metal in Earth’s crust does, and how it ended on our armpits.
Aluminium-based complexes react with the electrolytes in the sweat to form a gel plug in the duct of the sweat gland. What this means is that someone in some lab discovered that adding aluminium complexes into the already suspicious mix of ingredients in deodorants closes pores in the skin and prevents sweat production. Well, this new piece of information officially started my crusade for happy armpits, without metals from Earth’s crust.