It is not always good for the children to consume nutrition supplements without Necessity. It is better we can give fruits & vegetables as natural source of vitamins and minerals. It is essential to change the diet habit of your children so that it can benefits to your children. Try to give green leafy vegetables and fruits, which are beneficial for their growth.
I would prefer you can give Fruit and vegetables are rich in the nutrients including fiber and vitamins C, E and A. Many of these nutrients are also available in the form of dietary supplements. The nutritional supplements are not contains as much as phytochemicals like the fresh fruits and vegetables.
It is advisable to consult the pediatrician and then decide whether your child needs nutritional dietary supplements or not. If the doctor recommends you to give your child food nutrition supplements, you can also give it as suggested in the proper doses.