For one reason or another many people believe some anabolic androgenic steroids do not suppress testosterone and this simply isn't so. It is true, the level of suppression varies with each form; for example, Deca-Durabolin will suppress production completely after one dose, while milder steroids such as Anavar only suppress slightly but slightly is still suppression. In our case here, one of the often forgotten Dianabol side effects is in-fact testosterone suppression. It will not suppress to the degree of Nandrolone or Trenbolone but it is more than enough to warrant a need for exogenous testosterone therapy .
After the Kefauver Harris Amendment was passed in 1962, the . FDA began the DESI review process to ensure the safety and efficacy of drugs approved under the more lenient pre-1962 standards, including Dianabol.  In 1965, the FDA pressured CIBA to further document its legitimate medical uses, and re-approved the drug for treating post-menopausal osteoporosis and pituitary-deficient dwarfism .  After CIBA's patent exclusivity period lapsed, other manufacturers began to market generic metandienone in the .