Brewer's yeast by Horse Master is known for its multiple properties. It is particularly rich in proteins (about 40-50%), in group B vitamins (including B1 but also B5, B6, B8, and B9), and in Mannan oligosaccharides (MOS) which is a prebiotic that promotes the growth of friendly gut bacteria. Brewer's yeast is suitable for horses in training and for horses lacking in muscle mass, whose protein requirements are high for muscle protein synthesis. This care product  can also be given to mares in late gestation and early lactation, to improve colostrum immune status (Robertson Spearman K. 2004) and to foals prone to digestive disorders. Beer yeast  also intervenes on the good general condition and the dress.