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Dr Beaumont makes a strong and correct point. We all need to keep in mind that the important measure of zinc intake is the actual amount of elemental zinc and not the milligrams of a particular zinc salt. It is also worth noting, as is implied in our previous communications and in his letter, that zinc does not act alone but is one part of a complex trace element antioxidant system necessary for maintenance of normal tissue integrity and vision.
Newsome DA. Zinc and Macular Degeneration-Reply. Arch Ophthalmol. 1993;111(8):1023. doi:10.1001/archopht.1993.01090080017005