They are also both highly effective for building muscle. But you have to remember that toxicity depends on the dose. So, if you are using high doses of any androgens, you may be exceeding what could be termed a safe range. If a person chooses to use steroids, cycling off may be one way to avoid trouble. But for some athletes, such as high-level amateurs and pros, off periods are not deemed possible.
More research needs to be done with that population.
Besides presenting the real benefits and side effects of androgen self-administration, we hope that review boards will be more willing to approve human steroid studies in the future and feel that more money needs to be made available for research on these drugs. As of now, athletes are far ahead of established medicine and science in knowing what drugs increase lean body mass. Scientists really need to look more closely at how athletes are cycling drugs and how certain dosage regimens can be used clinically. That, to me, is absolutely necessary. To avoid serious side effects, you need to be monitored by a physician who understands the athletic use of these drugs.