Zinc SulphatePackage Unit: 10ml x 10V Main ingredient: Zinc sulfate 4. 4mg ml(1mg ml as zinc) The Role of Zinc in the Human Body: Zinc also plays a role in the regulation of the immune system. Being an essential element, it isnot synthesized by the human body but must be ingested through food or mineral supplements. Some of the common food sources of zinc include beef, poultry, seafood, and grains, among others. In adults, normal serum zinc levels are between 70