Is it everyone need vitamin or supplement?

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Lots of people and company promote their supplement products. Everyone claimed that their products is the best compare to others and can treat or prevent certain disease. Is it all they claim is true or just for the sake of earning profit? Or maybe can say like that, currently the fast food/GM food are not healthy.All the food can't provide enough vitamin and mineral to maintain our daily health. That the reason everyone need vitamin and supplement. If everyone eat healthy diet everyday, is it we still need all the vitamin and supplement? Or the vitamin and supplement can replace our daily diet that allow us no need to get any meal also can maintain our daily diet? What is all of your opinion? For my general opinion is take healthy diet and don't independent on vitamin and supplement. If not, we will lost our most enjoyable meal.