[black eyed susan]

I haven't got any experience of Maca, but I'm quite familiar with Fenugreek and Fennel. Basically for those two, the amount you should be looking at for NBE purposes is 3 teaspoons a day of each. I'm assuming that we're talking about powdered herb here rather than dried and powdered herb, otherwise it would be just 1 teaspoon a day of each.