As mentioned before, caffeine is the most commonly consumed stimulant for burning up body fat. Caffeine also has mild appetite suppressing properties. Slim Now Keto Reviews Luckily, there are products that exist that are designed to give men an extra boost in their weight loss journey. If you’re talking about endurance, please see the previous FAQ. If you’re talking about a sense of stimulation specifically, then the answer depends on if your fat burner supplement happens to contain stimulants, and if so, what the dose of the stimulant is/are. The higher the amount of stimulants, the more energy you’ll often get.