Halotestin also has a volumizing effect on the physique, and for those with low a body fat percentage, this will cause an immediately more contest ready appearance. This is due, at least in part, to Halos ability to increase mean hematocrit with and hemoglobin level as well as red cell mass. Halotestin also appears to act through cells already committed to respond to erythropoietin, which is good news for athletes, of course. As you can see, Halo has quite a profound effect on red blood cell production, and this action is clearly one of the most obvious mechanisms by which it is thought to exert its effects with regards to increasing strength and energy levels. It also points to the possibility of using it for athletics and sports where a high VO2 max is needed, such as Rugby, Mixed Martial Arts, etc..