Sustanon 250 is a unique blend of 4 different esters of testosterone. The principle purpose of attaching an ester to a steroid is to make it more lipophillic,( when injected intra-muscularly it can remain in the adipose tissue longer and is released in the blood-stream over time.) The longer an ester, the more lipophillic it is. Sustanon 250 contains 1 short, 1 long and 2 medium length esters that are all delivered over time, which gives a quick release, but a durable one as well. This may seem like a positive thing, but to a body building purposes its really not. A steroid user will use a long-acting testosterone and inject it once a week. With sustanon the levels will peak much sooner, and drop off sooner, leaving you with less than adequate androgen levels as the week draws to a close.So to use as one would use another long-acting testosterone sustanon would seem to be poor value. Sustanon may be very suited more to front loading. Results are obtained faster If 500 mg of sustanon were used on day 1, then again 5 days later on day 6 and start a cycle of enanthate/cypionate at 500 mg/week on day 11. That avoids the major crash at the end of the week and makes maximum use of the fast acting esters to saturate the system. As with all testosterones the rate of side-effects is quite high. Risks of androgenic side-effects (hair loss, prostate hypertrophy, deepening of voice) as well as estrogenic side-effects (gyno, water retention, fat gain) are real, and the use of ancillary drugs such as anti-estrogens will most likely be needed. Never start any cycle with testosterone without having at least a lot of Nolvadex and a few amps of HCG on hand. Testosterone is not in any way toxic, and should not give a user any problems apart from a high rate of occurrence of standard steroid side-effects. Because of its long-acting components, sustanon is mostly used as a form of long-acting testosterone. In such use doses of 500 to 1000 mg per week are used in a single injection, with decent results .