Turinabol is a derivative of dianabol that has undergone certain modifications in its chemical structure. The major difference between the two steroids is the presence of 4-chloro alteration in turinabol, which gives it properties unseen with dianabol. In fact, this alteration can also be observed with Clostebol. Thanks to this additional structure, turinabol can not interact with the aromatase enzyme, making it impossible for this steroid to convert into estrogen. Thus, the user does not need to worry about such estrogenic side effects as water retention, increased blood pressure, gynecomastia, and subcutaneous fat accumulation. For this reason, no aromatase inhibitors (AI) are needed when tbol is used alone, or together with other non-aromatizing steroids.