Does everyone need to take vitamins or do you only need them if you have a deficiency?

Deficiency/poor eati. Only if there is deficiency symptoms and low levels or not eating well balanced meals always on the run as that can lead to high risk life style including too much alcohol consumption and other high risk activities. Vitamin D Deficiency is quite common and can be asymptomatic and is only diagnosed by blood test But taking one a day multivitamin is acceptable especially if you are not eating well.