So this was the ultimate test if it was a placebo or not . . I ran out recently, I went to do my day 4 of purs routine. Instead of xtend, I used a half gallon of gatoraide. I missed the max weight I normally do on my last set, I had to drop everything by 5 lbs. About half way through my workout I couldn't finish the last few reps of every set. I had to take much longer recovery time between sets. I highly recommend it. I'm not working out without it again. Everyone has there own supplments they stand by and swear by. . this is mine. Disagree if you want. Just sharing my story.