It’s supposedly powered by Stimol, which is this:
"Stimol is a proprietary compound whose scientific name is citrulline malate. It has been clinically proven to drastically increase aerobic energy production during exercise and reduce fatigue.
Citrulline malate is made up of the nonessential amino acid citrulline and malate, or malic acid, which is an organic acid."
Here’s the nutritional info on the new formula (I hope this image works):