Senior MemberUsername: FredrikPost Number: 1405Registered: 03-2003Posted on Wednesday, July 21, 2004 - 12:23 pm: I do not know for sure but wyeast desribes their nutritient like this: Wyeast nutrient is a blend of vitamins, minerals, amino acids, free amino nitrogen compounds, zinc, phosphates, and other trace elements beneficial for rapid and complete, fermentation.