Interesting YT vid: * Zinc lozenges which dissolve in your mouth are highly effective against colds (it harms viral replication so it's worth trying against any sickness) * 75mg or more per day * Zinc acetate or zinc glutamate. Other zinc compounds are not as effective * Sweeteners and citric acid added will bind to the zinc ion and make it ineffective, avoid these... https://www.youtube.com/watch?v=Pi7syWem5CM