You may find that you need to mix two different kinds to get high enough levels of the things you need. Here is a pic of our mineral mix. As you can see no vitamins. We had thought about mixing but we love the very high levels of selenium and copper but because we feed dairy quality alfalfa that is loaded with a ton of vitamins and other goodies that are missing from our mix, we just decided to leave it as is. If its not broke, dont fix it. Also, the all stock grain we give prior and during milking season, also has a good balance.