6 year olds can choose to take vitamin D drops for a long period of time as needed under the supervision of a physician for the prevention and treatment of vitamin D3 deficiency. Vitamin D Drops is a clarified oily liquid containing vitamin D3, which can be used for the treatment and prevention of vitamin D deficiency.6-year-old children can choose to take vitamin D Drops for a long period of time as needed under the guidance of a physician, and should not take it for a long period of time on their own or overdose, to avoid causing adverse consequences. Adverse effects of this product is long-term overdose can occur bone and joint pain, skin itching, fever, headache, vomiting and other toxic symptoms. It is contraindicated in patients with hypercalcemia, hypervitaminosis D, hyperphosphatemia with renal rickets. Do not overdose, allergic to the product is prohibited. If 6-year-old children need to take vitamin D drops for a long time, they need to have a physician’s guidance, and should not take it on their own, so as not to cause adverse consequences.