my doc said to take extra vitamin D, but starting off with a multivitamin is a good idea to cover all your bases.
generally though, the body absorbs vitamins better from food vs pills. so eating an orange may be more effective than taking a vitamin C tablet (not that the tablet hurts).
go for fruits (esp. berries) and veggies that are many different colors-- they typically have more good stuff in them. like spinach over iceberg lettuce in salads, with carrots, radishes, bell peppers, etc.