I sometime use some of my colognes as deodorants, esp. those of which I have a 100ml+ bottle and don't like so much any more so I want to use them up quickly.. They are usually very effective
. Don't use anti-perspirants as most of them contain aluminium salts which plug the sweat gland - no good for you, some say.
In addition, "Aluminium is a neurotoxin, it adversely affects the blood-brain barrier, it is capable of causing DNA damage and it has epigenetic effects... Aluminium salts are thought to have a role in causing breast cancer by interfering with the function of oestrogen receptors..." Wikipedia