Currently, all aluminum manufactured for the public domain is anonized. They did this to remove the alzheimers effect. Unless you're using thirty year old pure aluminum foil, you're pretty safe. Think about it: it's known that aluminum consumption can augment or cause alzheimers, do you think they'd be selling drinks in it? No, of course not. They stopped using pure aluminum when a shitload of WWII vets got alzheimers from only being able to drink from a can because the water wasn't safe. I forget the chemical composition, but it's basically an alloy now.