The benefit of taking vitamin D is that it can prevent and treat vitamin D deficiency, such as rickets. However, additional vitamin D supplementation is not recommended for patients who have an adequate daily intake of vitamin D. If this medication is needed, it should be used under the supervision of a doctor. Vitamin D can be used for the prevention and treatment of vitamin D deficiency, such as rickets. It is indicated for people with vitamin D insufficiency or vitamin D deficiency. Additional supplementation is not recommended for people who have adequate daily intake of vitamin D in their daily diet. Prolonged overdose can be toxic vitamin D toxicity, which can be characterized by swelling, itchy skin, fever, headache, and vomiting in the early stages. Vitamin D is contraindicated in patients with vitamin D hypervitaminosis, hypercalcemia, hyperphosphatemia with renal rickets. Use with caution in patients with arteriosclerosis, cardiac insufficiency, hypercholesterolemia, hyperphosphatemia, high sensitivity to vitamin D and renal insufficiency. The use of this drug must follow the doctor’s instructions, not blindly use their own medicine, so as not to cause adverse consequences.