IT BALANCES A DEFICIENCY OF ANDROGEN FORMATION WHICH BEGINS TO FALL GRADUALLY WITH INCREASING AGE. THEREFORE IT IS SUITABLE FOR THE TREATMENT OF ALL CONDITIONS CAUSED BY DEFICIENT ENDOGENOUS ANDROGEN FORMATION. IN THE RECOMMENDED THERAPEUTIC DOSAGE, MESTEROLONE WILL NOT IMPAIR SPERMATOGENESIS. IT IS ESPECIALLY WELL TOLERATED BY THE LIVER.