You need B-3 specifically, in large doses. Not just in a B-complex. B-3 (niacinamide, NON-flushing) is absolutely critical.

Everyone keeps telling me they are taking B-Vitamins... I don't mean a simple multi-vitamin or a B-complex -- it's NOT ENOUGH. Please trust me on this one. I don't bother with B-12, although I've heard it's useful for some people, which is great. You need niacinamide, non-flushing form which is B-3. At my worst I was taking 1000mg per day. (Only for a short time period because it does have other effects in the body, but it was necessary for recovery.)