Quite simply, fat burners are supplements designed to help people lose fat. They are typically in pill or capsule form, to be taken throughout the day (in the morning and during the afternoon, but not in the late evening). High quality fat burners usually contain natural caffeine to help increase metabolism, as well as natural appetite suppressants. They are particularly effective when taken 20 – 30 minutes before exercise. Taking fat burners has many benefits, but a healthy diet and exercise should not be ignored.