Clinically Tested Weight Loss Formula. Powerful, Stimulant free weight loss support. Twinlab CLA Fuel provides 770 mg of pure CLA per serving, an amount consistent with clinical studies that suggest weight loss and body composition improvements. CLA Fuel is not a stimulant, making it especially useful for those who are stimulant or thermogenic sensitive. Helps reduce fat without reducing muscle, supports weight loss, promotes healthy metabolism, stimulant free.