I think synthetic vitamins throw the bodys natural systems out of balance. I get all my nutrition from organic high quality foods and natural supplements (bee pollen, spirulina, etc...).

I haven't gotten sick once since I started eating better about a year ago, and I had 10 mercury fillings in that just got removed last month. Getting all my nutrition from whole foods has worked for me, but I suppose some may need supplemented with mega doses of synthetic multivitamins.