I've taken vitamins forever......they help to ensure we get them since many UCers don't eat foods that would contain the vitamins in most supplements.
That would include milk (calcium. vitamin A & D), fruits (vitamin C, potassium, Vitamin A, iron, fibre..etc) and vegegables (iron, calcium, fibre, vitamin A..etc) and for some complex carbs (B-vitamins..etc).
As well, some medications either block or deplete some vitamins/minerals so it's good to add them through diet or supplementation.
Many people are low in Vitamin D....always good to get it checked.
Welcome to the forum!