There is little evidence that shows that vitamin(s) or supplements can control inflammation or treat rheumatic conditions in children. Studies looking into antioxidants like vitamins A, C and E supplements did not necessarily treat disease, but these nutrients are important for growth and development. Vitamin D is necessary if levels are low and taking a vitamin D supplement daily to meet optimal status is not harmful. Calcium supplements are needed if the diet is low in calcium. Adding omega-3 supplements can be a part of healthy eating but are not necessary if the diet contains foods rich in these fats like olive oil. Speak to your healthcare team about vitamins or supplements as part of your child’s health.