I just came to the site to ask specifically about Vitamins as well. I am 4 months post up and down 65lbs! I have been taking a multi-Vitamin, VitaminD3, Calcium, Biotin, B-complex, B12 - and have just realized i am not adding anymore Iron to my vitamin intake (not sure how i missed that one) but my Multivitamin has 18 mg of iron so i am reaching the minimum requirements from my Dr - I have started feeling sluggish about halfway through my day and believe that may be the culprit. Has anyone else had this problem???