I am currentlly using HMB by eas and am not really sure if its working. The reason why is because i am also takin some other supplements and my diet and training is good. I feel good, am always pumped, feel less sore, have lost some body fat, have kept lean muscle and I'm still going strong. All i know is that it is expensive and i bet that if i stop taking it i wont feel much different. Hoped this helped.