What Sustanon 250 is and what it is used for: 维持 250 is a clear pale yellow solution for injection containing the active ingredient testosterone in 4 (250 毫克/毫升) separate forms. The active substances of Sustanon 250 (see section 6 “What Sustanon 250 contains”) are turned into testosterone by your body. Testosterone is a natural male hormone known as an …