you can get pantothenic acid (b5) at any of your vitamin/supplement stores. be sure to also take a B-multi vitamin as well, so your body doesnt recognize a sudden overload of only one kind of b...
the b5 did help me a little bit, but my skin was already fucked when i started taking it.
i am currently on accutane and for me it has been a life saving wonder drug. on my 3rd month of it, and i can leave the house in a tank top again, my shoulders are completely cleared up, and i only have a little bit more on my back to worry about.