For the last year I have used Riomax MIneral Lick tubs and have been pleased with the results. Consumption has been exactly where expected. This year Riomax has a new tub available that contains yeast with the same mineral and vitamin content. They are making claims about improved digestion, better immune response etc. Does anyone have any experience with yeast in lick tubs (or other supplements)? Good idea? Benefits? Cost is about $20 more per tub.