I'd like to know if vitamins are really useful for someone eating a diet with sufficient and varied vegetables, fruits, grains and meats.
I've taken multivitamins before but was unable to detect any effect. I've heard that omega-3 supplements are good since most people don't get enough through their diet - though I'm not sure what "enough" means.
I'm interested in being healthy but highly skeptical about most of these, mostly due to the people typically promoting them (mostly IRL). Have any of these supplements been scientifically shown useful for people eating a fairly healthy diet? (my guess is not really, and that it's more important to focus on getting vitamins directly, from food?)