We take vit C as DH is someone who doesn't absorb it very well and quickly becomes deficient - especially in winter. So he gets mouth ulcers and his skin on his fingertips splits. Eating extra fruit & veg works a treat.
Vit D supplements are more comforting but are not generally accepted as very effective by many in the medical profferssion. Much better is getting outside, in the sun preferably, just walking to shops frequently is enough. Vit A comes in the same foods. Organic / extensively reared cattle can produce milk, cream, butter, cheese & yogurt with good vit D content. Some butter alternatives have vit D added. Cows intesivelt reared inside cannot, as we cannot, make much without the sunshine. Chicken eggs are similar - no sun = little vit D.
Vit B is in meat, eggs, cheese, yogurt, etc. so usually if the other vitamins are adequate, so will the vitB be,
Vit E is part of a potential cancer pathway and not usually needed. If too much is taken, the likelihood of cancer is increased. The same is true for fructose (that's why it is now not in foods for diabetics). Maple syrup has concerntrated fructose.