It's the third ingredient to MuscleTech's "Gakic" their newest creation. They supposedly bought the supplement for a Florida University's Research team. So I'm hoping its actually worth money. But long story short, it had three main ingredients, Glycine, the first is easy to find, so is the second Arginine. The third Kic is nearly impossible to find. I'm trying to make my own stack exactly like theirs but at a 1/3rd of a price.