The Dianabol utilization intensifies the sebaceous glands because it has a strong androgen component which is converted in dihydrotestosteron; this side effect causes for some athletes acne on the face, on the neck, on the thorax or on the shoulders. In case of a hereditary predisposition, the Dianabol can accelerate the baldness because of the same thing: its transformation in dihydrotestosteron. The Dianabol action effect is significant for the endogen testosterone. The investigations demonstrated that a 20 mg daily dose can diminish the testosterone production level in the organism with 30-40% after only 10 days of use.
In addition to the mentioned side effects several others have been reported. In both males and females acne are frequently reported, as well as hypertrophy of sebaceous glands, increased tallow excretion, hair loss, and alopecia. There is some evidence that anabolic steroid abuse may affect the immune system, leading to a decreased effectiveness of the defense system. Steroid use decreases the glucose tolerance, while there is an increase in insulin resistance. These changes mimic Type II diabetes. These changes seem to be reversible after abstention from the drugs.