Six year olds are allowed to use vitamin AD drops under doctor’s supervision. Vitamin AD drops, can be used for children over 1 year old, is suitable for the prevention and treatment of vitamin A and D deficiencies, such as rickets, night blindness, and pediatric hand and foot tics, adverse reactions for long-term overdose may lead to chronic toxicity, manifested as bone and joint pain, swelling, itchy skin, etc., is prohibited in chronic renal failure, hypercalcemia, hyperphosphatemia with renal rickets. Generally children need to supplement about 400-800IU vitamin D daily to help calcium absorption and utilization, the specific dosage should be used under the guidance of a doctor to avoid overdose. Different specifications of vitamin AD content is different, so specific medication is recommended to consult a doctor to use.