iO Brewers Yeast is a good source of B-complex vitamins.iO Brewers Yeast contains Vitamin B1 (Thiamin) Vitamin B2 (Riboflavin), Vitamin B3 (Niacin), these B group vitamins are known for their ability to maintain a healthy skin, assist the nervous and digestive system of the equine. Why is this so good? Because many owners now avoid diets for their horses which contain a lot of grains which normally would supplement these vitamins, so providing them in this natural package is a great way of avoiding metabolic disorders. Because it is a source of chromium, iO Brewer?s Yeast improves glucose tolerance and may improve blood sugar levels. It can definitely be a part of the overall dietary answer to help many issues. iO Brewers Yeast is a supplement for horses, dogs and other animals. It can be mixed into the animal's food, and although it has a distinctive taste if introduced gradually over a period of a few days there should not be any problems with palatability.