Vitamins and Supplements Dictionary Pro+
This version is cheaper than the Pro version and I have no idea why. Sorry kids but I'm not spending $15 to check them both out. Since there's no real information about the cost difference I'd likely stick to the cheaper one, especially since they're both pretty spendy. The best part of the app is that you don't need an internet connection. Do be warned that this means it's eating up a lot of space on your phone, but still, you can't always count on a connection to get information and if you wanted to do that you'd just search the web now wouldn't you?!