Studies schmudies. who cares what them there scientistis say. I dont think that is what he asked though. Yes, alot of people on here put out minerals. I use a bunch of different stuff trying to figure out what i like. This year im using the mineral block from Tractor Suppy and Whitetail Inst 30.06 protein plus at my sites. I have used deer cane before and they absolutely loved it. The main attractant in all these is of course the salt. Check your bag and see if it contains trace minerals and the main stuff is calcium and phosphorous but these are not needed in large quantities. 99% is going to be salt. Deer get most of what they need from the food they eat just like us. but the occasional vitamin doesnt hurt. and the salt helps them digest in theory.