As with all Testosterone products, Sustanon is a strong anabolic with pronounced androgenic activity. It is most commonly used as a bulking drug, providing exceptional gains in strength and muscle mass. Although it does convert to estrogen, as is the nature of Testosterone, Sustanon injectable is noted as being slightly more tolerable than cypionate or enanthate. As stated throughout this book, such observations are only issues of timing however. Blood levels of Testosterone are building more slowly, so side effects do not set in as fast. For equal blood hormone levels however, Testosterone will break down equally without regard to ester. Many individuals may likewise find it necessary to use with this steroid an antiestrogen, in which case a low dosage of Nolvadex or Proviron would be appropriate. Also correlating with estrogen, water retention should be noticeable. This is not desirable when the athlete is looking to maintain a quality look to the physique, so this is certainly not an idea drug for contest preparation.