A lot of people think that their diet is going to give them all the nutrients they need to maintain health.  Think again.  We don't have the healthiest food any more.  See all the reports about salmonella or other bacteria that is in our foods?  We are more stressed than ever, don't sleep as well, have more heart problems, diabetes and obesity.  We are nutrient deficient and need to replace these nutrients with a good supplement or vitamin regime  We should all take A Multi-vitamin/multi-mineral supplement with our breakfast and lunch. We should all take Vitamin D, and Omega 3 fatty acids and some extra Vitamin C.  These are some of the basics.  More might be needed with other health problems.

Vitamins don't replace good eating.  You can't eat crappy food and expect your vitamins to do the work.  If your diet is bad, then your digestion is bad and you won't absorb your vitamins very well.  You still have to eat well but also take a good vitamin and lots of good water too.