If you are having a feed mill mix your feed and they have a nutritionist that helped you with your ration, it should have all the mineral in it that you need (but check the ration reciept that they give you). If your feed mill doesn't have a nutritionist on hand, go to a feed company that does like Landmark etc. Feeding more mineral than the animal requires doesn't help you AT ALL and can just cost you money. Most excess minerals in the heifer, steer, bull, or cow's body is not stored (their are a few exceptions), they are just excreted. Same with vitamins. Yes, all minerals are not created equal, however you don't necessarily have to buy a very certain brand. You can find others that are just as good. What we've found is that not all cattle respond the same to the same feed, mineral, hay ect. If a brand isn't working, switch!