The first week, I did take a regular multivitamin. Wow, did I feel lousy!! But, don't worry. Those icky feelings, and at least for me anyways, monstrous headaches (I gave up caffeine as well as carbs--eeke!) will pass. Adding potassium and calcium/magnesium supplements to the multivitamin I was taking made a big difference. I would definitely recommend adding them to your vitamin regiment.

(I would also think about purchasing some Metamucil as well )