Ok, Have any of you used energy and or performance Supplements? A couple of weeks ago I went to a local GNC. I have used a few different types of supplements. The one I purchased is named BLOX Performance. It is supposed to help with performance and recovery. What I like to do is try a supplement by not doing any type of physical activity. Just to see if there is any side effects before I actually exert myself while using it. So far the only side effect I had was a severe headache about 3hrs. after I took it. The good news is it does do what it advertises. It gave me the most energy out of all other supplements I've taken before. I did decide to keep it and try it on a day I go ride. I will let you know if I still like it. Plus I will let you know if it gives me the NOS boost I need. The good thing about GNC is they will refund any money if not satisfied.