Then show me the proof. I've never been proven to have a Vitamin deficiency although I was slightly anemic, as a child. My first Neuro did all the blood tests and found no deficiencies, so he didn't recommend any supplements.
Since being DX with MS, I have taken it upon myself to indulge in the usual popular Vitamins (the list is long and daunting), but came to the conclusion, that they were not improving my health or my life and I was just flushing a bunch of money.
The only Vitamin I may be a little deficient in now, in me old age, is Vit D3, as I am never in the sun, anymore.
So, unless you are vitamin deficient, and your Doc has prescribed or suggested them, how would supplements be helping you?