I received a sample pack of this stuff. Holly S*iT!!!. This stuff is too damn strong for me!. I took the sample pack which is 3 huge capsules(1 serving) immediately after getting out of bed. Right away I started to feel warm. After that I started feeling dizzy and light headed. So much so that I felt like I was going to pass out. My heart pounded so bad I felt like I was gonna have a heart attack. I woke my wife out of bed and was going to have her take me to the Emergency room. I really didn't want to go though, so I waited it out. I decided to eat some chicken and have a protein drink. I sat down and couldn't get up because I was so dizzy and afraid to move and I felt better sitting down just watching tv. I had the wife make my chicken for me. I kept shivering and I am usually always hot. I was shivering so much that my body was shaking. I am finally calmed down at this point and I feel better. I usually do my cardio on an empty stomach I guess I can't today. Still I feel slightly dizzy but I can handle it, and my heart is no longer racing. I usually don't respond to stimulants like this at all. This product is just way to much...Talk about feeling "cracked out"!. I really thought this was going to be a medical emergency. Also I turned all red like with poisiden. I recently tried redline extreme and it didn't do anything like this to me. The reason I mention that is because a lot people say Redline Extreme is really potent. Hahah. Redline Extreme compared to Primaforce Rage is a Phucking Joke!. Primaforce Rage is just too much for me, if anyone tries this product please post your experience and use with CAUTION!. Also I'm crashing pretty hard right now, and I still have not done my cardio damn it!