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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 .