do not, I repeat DO NOT waste you money on this stuff. As I always tell my patients/clients, anything that is an OTC supplement listing a Proprietary blend you should run from. Those words are the key that the product is trying to sounds impressive to the medically untrained consumer. IN real life FDA prohibits such secret formulas in medications they review. Yes, the contents of the Blend are listed, but usually never in specific quantities of each ingredient, rather the Blend as whole. Most of the herbs they throw in there, if you take the time to research each one, have little to nothing to do with what the product is about.
Another key tip this is something to avoid. try even finding an online listing of the actual ingredients. You won't on their website, just the key sales points that it's made with all natural ingredients (again playing on non medically trained consumer's misunderstanding of what that actually means).
If your energy levels are low, go over your diet with a personal trainer or dietician and go over the lack of energy issues with your doctor--get your testosterone levels checked along with your regular blood work.