When all my symptoms first started, I was convinced it was low Iron, and B vits so I started taking a high dose from a premium brand. Made no difference to my symptoms, but when I went to the docs, he said my levels were too high and to stop the vits. Although a lifelong vege, like Mandy says, my love of leafy greens, broccoli and the like meant I became too high by topping up too much. This surprised me as I'd assumed, without red meat, I'd be naturally low.