Getting "cut" requires cutting your calories. This can cause your testosterone level to fall and your cortisol level to increase. Both of these hormonal changes can interfere with muscle building and are aggravated by stress of even a few nights of poor-quality sleep. That's why GAT researchers developed Jetfuel T-300. This precision "3-stage" formula contains key active that help you lose body fat without losing testosterone at the same time. When your metabolism runs faster, it burns fat faster. In an IRB-approved, double-blind placebo-controlled clinical study, the Acacia rigidula extract found in T-300 increase subjects' metabolic rate for up to 3 hours and by up to 12.5%. These figures are comparable to ephedrine. Healthy levels of free ("active") testosterone are also critical to the achievement of bodybuilding success. T-300 contains CFB, a patented nature-identical compound shown in clinical studies to increase free testosterone levels by an average of 1%. CFB works quickly. In the same studies, it produced measurable increases in total and free testosterone within 3 hours.