Why use testosterone in cycles? Bodybuilders almost always use testosterone in cycles. This is because testosterone will shut down the body's natural testosterone production; cycling the testosterone will prevent permanent shutdown. A typical testosterone cycle for a bodybuilder consists of about eight weeks of the steroid followed by four weeks of post-cycle therapy.
Testosterone is available in patches, creams, pills, and through injections, but bodybuilders almost always inject it. It is most bioavailable through injecting, and most compounds need to be injected only one to two times a week.