No it's not derived from anything sweet. I read in Cutler's book that it increases secretion of bile (which would make you think this would lead to a decrease in yeast?) and also increases the liver secretion of non-protein sulfhydryl groups (sulphur containing compounds). This is irritating to the bowels and anus and may cause anal itching, esp if you have haemmorhoids.
Whether this happens to everyone or just to people who already have candida I dont know.
So you take 40mg a day? See if there's a correlation between when you take it and how you feel. You could also experiment doing without it and see how you feel.