I don't know if there is such a potion, I would suggest practice, you could try tea, but I don't know what kind, pepperment, or something like that.
But then again, potions are not like what television makes it out to be. They don't throw together ingredients and say a spell, and something happens.
So my advice is not to use a "Potion" pratice your psyschic powers. I got by this quote "Practice makes perfect." Even though in reality practice doesn't make perfect because no one is perfect, everyone has a flaw, but it makes it better.