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I am a proponent of using the lowest effective dose, and I do well on the equivalent of 44 mg testosterone cypionate per week. However, I take my testosterone as daily injections of a propionate/enanthate blend. Although my average serum testosterone is around 500 ng/dL, daily peak levels are more like 700 ng/dL. There is some evidence that daily peak levels contribute to the benefits we receive from testosterone.

With that as background, I would have some concern about the pattern of your serum testosterone on 25 mg Sustanon twice a week. It's possible you would have pretty low levels in the day preceding each injection. This may or may not be a problem for you. It's just something to keep in mind.

How does your estradiol compare to your testosterone? A low ratio could contribute to body composition issues.