When you don’t or can’t eat right .... vitamins are in my scram bag.
I read years ago that vitamin, “I think C” would prevent scurvy. If so there is no question that vitamins have a potential benefit.
I think if you eat a healthy diet then they are not necessary but some of us do not eat a healthy diet.
I remember in Churchill’s six volume “History of WWII”, he was trying to figure out ways to supply Malta. He suggested that maybe they could parachute vitamins to them. A docter explained to him that you need a lot more than vitamins. At least Churchill was thinking.
I seem to remember some talk about in the FDA looking at banning or greatly restricting sales of multivitamins in 2014 ....