Testosterone blends like Sustanon 250 (testosterone propionate, phenylpropionate, isocaproate, decanoate) are prescription medicines for hypogonadism. In bodybuilding, a 250mg testosterone mix is used as a base androgen to support muscle hypertrophy, strength, nitrogen retention, and recovery, often chosen for its mixed‑ester profile that gives both fast onset and sustained levels. Users employ it in bulking or recomposition stacks.