Vitamin D can be supplemented through diet, sun exposure, and medication.
1. Diet: you can eat more food containing vitamin D, such as saltwater fish, egg yolks, animal liver, etc. for supplementation, but for people who lack vitamin D, vitamin D supplementation through dietary supplements is relatively limited and slow to take effect.
2. Sun exposure: The ultraviolet rays in the sun can help a kind of cholesterol under the skin to be transformed into vitamin D and produce activity so as to be utilized by the body. Therefore, you can get appropriate sun exposure to supplement vitamin D. However, you need to be careful to avoid sun exposure, so as to avoid skin burns by the sun.
3. Medications: It is recommended to take vitamin D supplementation medications, such as vitamin D2, vitamin D3, cod liver oil, etc., under the guidance of a professional doctor.