This has proven contentious, with the Court of Arbitration for Sport suspending the IAAF policy due to insufficient evidence of a link between high androgen levels and improved athletic performance. The most common route of administration for testosterone is by intramuscular injection. Testosterone pellet implants are approved for use in postmenopausal women in the United Kingdom. Other androgenic side effects, such as weight gain, pattern hair loss, and voice deepening, were also reported in some trials, but were excluded from analyses due to insufficient data. The changes were more pronounced with oral testosterone undecanoate than with parenteral routes, such as transdermal testosterone.
