Muscle fuel Anabolic is a scientifically engineered muscle building MRP supplement, formulated for athletes that are serious about building muscle mass. It should not be used by persons under the age of 18 years. It should not be used for weight loss. For bodybuilders and athletes or individuals on a mass gaining plan. Muscle fuel Anabolic is a scientifically engineered muscle building MRP supplement, formulated for athletes that are serious about building muscle mass. It should not be used by persons under the age of 18 years. It should not be used for weight loss. For bodybuilders and athletes or individuals on a mass gaining plan.