It is a very good product as the girls explained. I also recommend it!
I do some to my horse every year. As Amy said, it is a great product for hairs, digestion, diseases, anxiety... It contains vitamin B, amino acids and trace elements.
Every year I do a cure of brewer's yeast! It really works on my horse but I think it depends of every horse. It helps for many things: growth of hair,
amelioration of the digestion, better reaction to stress, tiredness, virus...