Let me try to provide a MINIMAL list of products that a bodybuilder should NEVER have used in his ENTIRE LIFE to qualify as a true natural bodybuilder:
* any muscle growth promoting hormones such as for example:
o testosterone
o anabolic steroids (AS)
o human growth hormone (HGH)
o insulin
o insulin-like growth factors (IGFs)
o any anabolic prohormones, prosteroids or precursor steroids
* clenbuterol
* erythropoietin (EPO)
* ephedrine and ephedra
* stimulants such as amphetamines
* diurethics
* experimental muscle growth promoting products such as:
o selective androgen receptor modulators (SARMs)
o myostatin inhibitors
o gene doping
o stem cells