 Trenbolone carries a rating for both anabolic potency and androgenic potency of 500, relative to a standard of nandrolone acetate (rating 100 for both).In addition to its anabolic and androgenic activity, trenbolone is an agonist of the progesterone receptor (PR), and in relation to this, has moderate to strong progestogenic activity.Conversely, trenbolone acetate is not a substrate for aromatase and hence lacks estrogenic activity.