Creatine supplementation is used to increase your body’s own creatine stores in the muscle. Your body uses creatine as a temporary energy storage medium. Larger creatine stores marginally increase your ability to work out more effectively. Creatine also causes your muscles to retain more water, which gives them fuller appearance and very slightly improves their ability to grow ( think of it this way : dehydration - bad, hydration - good ).
but no matter what the supplement compaines tell you it ain’t no magic bullet, just a supplement.
all the best sh1t is illegal. basically the most effective drugs work by overriding your body’s own regulation mechanisms (and are illegal) and the weak ones only work by giving your body extra substrate to work with ( and are legal ).
i dont really understand why drugs like HGH are illegal though, i never heard of any medical problems from HGH use.