Testosterone can be administered parenterally , but it has more irregular prolonged absorption time and greater activity in muscle in enanthate , undecanoate , or cypionate ester form. These derivatives are hydrolyzed to release free testosterone at the site of injection; absorption rate (and thus injection schedule) varies among different esters, but medical injections are normally done anywhere between semi-weekly to once every 12 weeks. A more frequent schedule may be desirable in order to maintain a more constant level of hormone in the system.  Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. In addition, because estered testosterone is dissolved in oil, intravenous injection has the potential to cause a dangerous embolism (clot) in the bloodstream.
Hardy debuted in Total Nonstop Action Wrestling (TNA) on June 23, 2004, at the Second Anniversary Show , in a match against . Styles , for the TNA X Division Championship .  He also debuted his new entrance theme "Modest", a song performed by Hardy himself, and a new nickname, "The Charismatic Enigma".  The match ended in a no contest when Kid Kash and Dallas interfered.  Hardy returned to TNA on July 21 and was awarded a shot at the NWA World Heavyweight Championship .  Hardy challenged for the title on September 8, losing to NWA World Heavyweight Champion Jeff Jarrett .  In October 2004, he won a tournament,  earning a shot at the NWA World Heavyweight Championship on November 7 at Victory Road , TNA's first monthly pay-per-view.  Hardy was defeated by Jarrett once again in a ladder match at Victory Road following interference from Kevin Nash and Scott Hall .