"It is totally illegal, but you can buy it at GNC"
LOL!!! You're brutal.
It's and anti-oxidant that is used to direct the sugary carbs (also called High gi carbs) you eat into your muscle cells instead of your fat cell and it lowers your insulin levels and your fatty acids. Your body stops burning fat in the presence of insulin so when you lower it you continue burning off fat.
The rest you can do a search for.