My opinion is zinc compound like carbonate etc. Silver and copper supplementation in higher doses is toxic. Zinc supplementation helps body to come back to normal compartmentalizstion of iron depriving bacteria of iron. Iron is the cofactor of many enzymes of bacteria for their metabolic functions. Zinc has also double edged sword activity. Its dose should be within permissible limit. The Papers of this researcher on zinc supplementation in tuberculosis patients may be gone through.