Boldenone Undecylenate is a steroid that has well balanced effects that make it good for both cutting and bulking cycles. It aromatizes very little, meaning that there is little to no estrogenic side effects such as water retention or "gyno". It also increases protein synthesis and red blood cell count, meaning that nutrients are transported throughout the body much more effectively.
This makes it a good choice for athletes and bodybuilders who are looking to make solid gains without the extra bloat, or are nearing contest. The increased red blood cell count caused by this steroid also increases oxygen transportation throughout the body, giving athletes and bodybuilders greater endurance and the capability to endure cardio sessions for much longer periods of time.