For the Mineral Buffet to work you must first buy the A+ Mineral Starter Kit. Do not buy individual essential minerals and only serve a few to your livestock as this can be harmful. All 20 essential minerals must be made available to the livestock at all times.  It's all or nothing. 

NOTE: When ordering, shipping is by weight. Small box ($13) holds up to 2lbs. Medium box ($22) holds up to 12lbs. Large box ($30) holds up to 20lbs.