The best have side affects and require needles, could you please reword your question for some more specifics on what you are really looking for? A magic caffeine pill for just a little energy all the way up to a Test, Tren, Dbol stack guaranteed make your muscles small, but shrink your nuts to the size of raisins, lots of variable out their and it all depends on these questions:
Where are you now?
Where do want to go?
How long do you have?
What sides and risks are you willing to take?
Does legality matter?
Does your goal involve a competition in which you will be tested for PEDs?