Summary: TestoFuel is a bodybuilding supplement that has the ability to boost the body’s natural testosterone levels and produce greater muscle mass. Vitamin D, oyster extract and other safe ingredients found within the product are capable of regulating certain processes within the body, which can result in more productive workouts. TestoFuel contains no steroids or stimulants, making it safe to use by men who are looking to pack on some extra muscle. The supplement comes in capsule form, and up to four capsules per day should be taken in order to experience the best results. Most users see noticeable muscle gains after only two months of beginning the supplement.