Boldenone undecylenate is a derivative of testosterone, which exhibits strong anabolic and moderately androgenic properties. The undecylenate ester greatly extends the activity of the drug (the undecylenate ester is only one carbon atom longer than decanoate), so that clinically injections would need to be repeated every three or four weeks.
Masteron is a European injectable preparation containing the steroid drostanolone propionate. Drostanolone is a derivative of dihydrotestosterone, most specifically 2alpha-methyldihydrotestosterone. As a result, the structure of this steroid is that of a moderate anabolic/potent androgen which does not aromatize to estrogen
Methandienone is one of the most widely used steroids. It is mainly produced in tablets and they are best suited for the beginners. It is relatively cheap and has a strong effect, and that was the reason for the high popularity of methane among bodybuilders and lifters in Europe.