i don't know jack about yohimburn, so i can't help you there...i kind of skipped over all the supps and went right for the pharmacy
femara is a fantastic drug...it's intended use is for breast cancer, and it's action closely resembles that of arimidex, with a few major differences...
1) it targets conversion in addipose tissue, and is MUCH more effective at stopping aromatase activity in that area.
2) instead of retarding IGF-1, it ups it!