Zinc is a key antioxidant mineral as it protects the cells from oxidative stress. It is important for the normal function of the immune system as well as the maintenance of normal skin and vision. This supplement provides Zinc in the citrate form for high bioavailability, plus Copper in the correct ratio. Zinc is one of the most important minerals for many functions in the body. Highly bio-available citrate form. Zinc is a key antioxidant mineral which protects cells from oxidative stress.