Some of the most widespread side-effects of Trenbolone are hair-loss, acne and high blood pressure. The other common side-effects for the most part associated with anabolic steroids due to estrogen conversion such as bloat and water retention are absent here due to no aromatize effect. As Trenbolone does not aromatize many assume Gynecomastia is of small concern. As a powerful Progestin this can show the way to an even worse case of Gynecomastia but classically only in very sensitive individuals. On the other hand, almost all who complement with an aromatase inhibitor such as Letrozole or Arimidex will battle all progesterone special effects successfully.