<<Disclaimer: Verify this information before applying it to your situation.>> Dave, my jar of super nu thera says "Does not contain sucrose, starch, artificial color, preservatives or yeast." I do not think it will spoil your yeast free diet. My son is on the same sort of regimin. I know that often B vitamins are yeasty, but my guess is that the makers of super nu thera are aware of problems with yeast and other so called harmless things. That is why I switched from making my own "cocktail" of supplements for Patrick to using the pre mixed powder. Now if I could just get him to eat it! Pam [log in to unmask]