Hi J.---Why do you feel you need to supplement with vitamins? This is probably the best place to start. Have you been diagnosed with deficiencies?
I work with several doctors and Naturopaths. The one I work with most closely also has her PhD in Nutrition. I can tell you what she teaches AND what I learned in my Foods classes at college...your best source of nutrients, vitamins, minerals, antioxidants and all of the other phytochemicals, is FOOD. Prior to my taking a series of wellness classes taught by Dr. Pam, I, too, was very confused when I considered maybe taking a multi-vitamin. You stand there in the store and are totally overwhelmed by all of the choices...and that doesn't even include the minerals and other antioxidants like beta-carotene, resveratrol or the many, many others.
So, food should be your first choice. I can also share many articles and research summaries that show that vitamins do NOT help to protect from cancer AND that they can even cause problems in the body. This is because a multi only contains a very small selection of all the nutrients found in food. There are over 10,000 known nutrients in an apple alone. There is no way that a manufacturer can put everything into one 'pill'.
So what do we do, as I truly believe that we do need help. Our food is NOT as nutritious as it once was, or needs to be to prevent disease as we age, or to even keep us healthy every day. We know this because kids are being diagnosed with old people diseases at younger and younger ages. Our best bet is to use a high quality, researched backed whole food based supplement. I know of one that many doctors and health care professionals around the country also recommend. It contains the juiced and dehydrated powders of 15 different fruits and veggies and the bran of 2 grains. It works to help strengthen and balance the immune system, protects and repairs DNA, supports the cardiovascular system (really impressive research) as well as reducing oxidative stress and markers of chronic inflammation, and the independent research proves it. If you would like to know more about what my family does for nutrition insurance, I would be most honored to share. I hope this has helped, giving you some info how you might want to proceed from here. Good luck. I look forward to hearing from you. In health, D.