The Areds 2 formula is the only supplement shown to slow macular degeneration. However, there are some people who do better on this formula without zinc. I simple DNA test can be performed by your eye doctor. It will tell you what formula works better for you. For me it is the zinc free version. This is the only version of this formula that I know of on the market. I have now taken it for several years. So far my early macular degeneration has not progressed at all. I take it daily.