Is an oil based injectable testosterone blend that contains four different testosterone esters: Testosterone propionate, testosterone phenylpropionate, testosterone isocaproate and testosterone decanonate. Sustanon is designed to provide a fast yet extended release of testosterone, usually requiring injections once every 3 to 4 weeks in a clinical setting. This is an improvement from standard testosterones such as cypionate or enanthate, which provide a shorter duration of activity. As with all testosterone products, sustanon is a very strong anabolic drug with pronounced androgenic activity. It is most commonly used in bulking cycles, providing exceptional gains in strength and muscle mass.