Our nutritional yeast is specifically grown for inclusion in our main horse feed ' Base Mix. It is not brewers yeast. The yeast is grown purposely as a feed ingredient and not a waste byproduct of the brewing industry. This is important because, as a specific nutritional yeast, it is of higher quality, more consistent quality, and does not contain the chemical additives as used in the brewing industry. Furthermore, our nutritional yeast is fractionated. This means the yeast cell wall is 'cracked open' to release the contents of the yeast, making it more easily digested and assimilated through the digestive tract. It contains higher levels of essential amino acids than brewers yeast, and also contains more nucleotides and other micro-nutrients.