I would advise not to stack up too many multivitamins and food supplements, because quite often various elements overlap and You can get nasty side-effects. Last Christmas I got sudden increase in ALAT test (liver enzimes) - normal range is <41, around 120 means You are close to hepathitis, and I had 80. I panicked and thought that this was because of oral estrogen delivery, but after I cut down all vitamins (biotine, prenatals, B-vitamin complex, iodine and folic acid) it stopped and my endo confirmed that sometimes having way too much vitamins, elements etc can too cause extra stress to liver.
I am only taking fish oil, biotine and during breast growth spurts - iodine. I switch folic acid in and out but might use it more regularly next year due to change of AAs from Spiro to Androcur.