Boldebolin is a steroid which contains the hormone Boldenone Undecylenate. It is effective for building muscle mass and has low side effects. It can be used in both cutting and bulking cycles, and is especially popular among bodybuilders who are looking to get into contest shape or increase endurance. It also increases protein synthesis and red blood cell count, and is known to increase vascularity. Bodybuilders often stack Boldebolin with other anabolic drugs such as testosterone or Deca-Durabolin.