Boldenoneundecylenate is a derivative of testosterone, which exhibits strong anabolic and moderately androgenic properties. The undecylenate ester greatly extends the activity of the drug (the undecylenate ester is only one carbon atom longer than decanoate), so that clinically injections would need to be repeated every three or four weeks. In veterinary medicine it’s most commonly used on horses, exhibiting a pronounced effect on lean bodyweight, appetite and general disposition of the animal.
This compound is also said to shows a marked ability for increasing red blood cell production, although there should be no confusion that this is an effect characteristic of newly all anabolic/androgenic steroids. The favorable properties of this drug are greatly appreciated by athletes, being a very popular injectable in recent years. It is considered by many to be a stronger, slightly more androgenic Deca-Durabolin®. It is generally cheaper, and could replace Deca in most cycles without greatly changing the end result.