Olsson’s Stone Block is a supplement for stock that are on diets predisposed to bladder stone formation. Bladder stones can be a problem in ruminants, when stones block the urethra and prevent urination. Factors that predispose stock to stone formation include the high phosphorus levels in grain, excess sodium bicarbonate in the diet (used to help prevent acidosis), and reduced water intake due to poor water quality. Vitamin A deficiency can also be a cause of bladder stones.