In my opinion if you are a man, the best cure would be, what I like to call a "womans magical touch". It is a psychological thing pretty much. It doesn't actually cure, but somehow a man still stands up and keeps on fighting, like magic. Maybe it is because he doesn't want to seem weak in front of a woman or make the woman fell better that she has healing powers.
In general the best medicine is ofcourse laughter. It doesn't actually have healing powers but still makes you feel good.
Or there is a third thing, which is air. Without air you would die, so it heals you all your life. Keeps you alive.