In addition to being a concentrated and consistent source of metabolizable lysine, the enhanced versions of ProvAAl also serve to supply concentrated and consistent methionine from multiple sources. ProvAAl Basic, ProvAAl Preferred, and ProvAAl ELITE include methionine hydroxy analog which provides Rumen Degradable methionine. ProvAAl Preferred and ProvAAl ELITE also incorporate Smartamine M, the premium protected methionine source.