Ive been taking it for three days now, it gives you that pump, i don't feel any different while taking it. I'm taking pro-complex, amino acids in a muli supplement from GNC. Post a commett to me in three weeks and i will tell you the aftermath it might be too sooon. Ive also takin Gakic, but in power form. Which sucks, cause it taste like shit. It worked for me, it gave me a increase in power, but the come down sucks. Overall i liked it!