Description Boldenone undecylenate is an injectable veterinary steroid that exhibits strong anabolic and nroclerattely androgenic properties. The undecylenate ester extends the activity of the drug greatly (the undecylenate ester is only one carbon atom longer than decanoate), so that injections need to be repeated only once every 3 or 4 weeks.The well - balanced anabolic and androgenic properties of this drug are greatly appreciated by athletes, who generally consider it to be a stronger, slightly more androgenic, alternative to Deca-Durabolin. lt is generally cheaper, and could replace Deca in most cycles without greatly changing the end result.