One of the farmers up where I hunt got a good laugh at my exspense. He gets a kick out of pointing out how gullable "City Folk" are. He says you can buy a 50 lb. bag of basic cow minerals for 7 dollars OR go to Cabellas or BassPro and spend $35 on 10 pounds of the exact same stuff served up in a bag with a picture of a big buck on the front! Minerasl do help. I have seen mineral spots that bring in deer for years after they have been put down.