Superpowers exist, but most of the time, they need to be natural. No, I do not think people can walk through walls and bench-press train cars....yet. ESP is real and actually common among people, superhuman senses does exist like jjunebreakable said earlier. I have enhanced senses, abnormal reflexes and sometimes when I think of something, shortly after, it happens. It's minor, but it still is a superpower. But you must think, do you want superpowers just so you can be cool? Or do you really want to use them for a purpose of helping people. And as for your question, no, there is currently no 'potion' available that will give you superpowers. Maybe in the future there will be, but for now, I won't guarantee there is one.