Take vitamin D on the advice of a professional doctor. Don't eat casually without permission. Doctors who sell drugs can't be trusted. Don't eat in some small clinics. The safest thing is to bask in the sun. 7- dehydrocholesterol produced by cholesterol is stored under the skin of human body and can be converted into vitamin D3 after ultraviolet irradiation. Proper sunbathing is enough to meet the human body's demand for vitamin D.

Expose hands and feet 30 cm a day and bask in the sun for 30 minutes to effectively prevent vitamin D deficiency.

Overexpression of vitamin D: Some scholars believe that long-term daily intake of 25μg of vitamin D will cause poisoning, which may include some people who are sensitive to vitamin D, but long-term daily intake of 125μg of vitamin D will definitely cause poisoning. Poisoning symptoms include abnormal thirst, eye inflammation, skin itching, anorexia, lethargy, vomiting, diarrhea, frequent urination, abnormal calcium precipitation in blood vessel wall, liver, lung, kidney and stomach, joint pain and diffuse bone demineralization. The maximum tolerable intake of vitamin D in China is 20 μ g/g. ..

Therefore, oral administration or injection is not recommended, and the safest thing is to bask in the sun.

Expose hands and feet 30 cm a day and bask in the sun for 30 minutes to effectively prevent vitamin D deficiency.

Regarding calcium supplementation, the safest thing is food supplement. Foods with high calcium content include: shrimp skin, kelp, laver, crispy fish, oyster, laver, sesame sauce and so on. Animal bone soup is also rich in calcium, but vinegar should be added when cooking to promote the dissolution and absorption of calcium.