multivitamins have side effects..
B complex in it is very heaty..
your urine might turn yellowish and concentrated with a strong smell..
your nose might bleed..
you need to drink a lot of water

well.. i think when you are extremely heaty you tend to bleed from your nose and its not because of some chronic disease..

i dont.. my urine turns yellowish and concentrated.. then my nose bleeds..

now i cut down the dosage into half a tablet instead of 1 tablet.. i dont get those anymore..

maybe u should try cutting down the dosage if you think by taking the multivitamins gives u headache