Muscle Factor Athletic Line HMB, Forskolin, Calcium and Vitamin D formula MUSCLE FACTOR provides several ingredients that are either vital nutrients for optimal function or very popular with englihtened athletes. Our formula delivers Forskolin and HMB in scientifically studied, manufacturer recommended doses! The one serving provided 100% recommended daily amount of Vitamin D contributes to the normal function of the immune system and to optimal muscle function, and also to the maintenance of normal bones, teeth, and to the normal absorption, utilisation of Calcium and Phosphorus. Calcium contributes to normal energy-yielding metabolism, and also helps with normal muscle function and proper neurotransmission, which are important functions to every hard training athlete!