Zinc is an 'essential trace element' because very small amounts of zinc are necessary for human health. Since the human body does not store excess zinc, it must be consumed regularly as part of the diet. Zinc is not easily absorbed in the body unless attached to another substance. Chelated zinc has been attached to amino acids so it is partially absorbed by the body. Zinc contributes to the maintenance of normal bones, skin, hair and nails. It also helps with the maintenance of normal cognitive function and normal fertility and reproduction. It is suitable for vegans and vegetarians.