Vitamin D is a derivative of sterols, and natural food sources of vitamin D are relatively rare; most vegetables do not contain vitamin D or have particularly low levels. Foods containing vitamin D include herring, egg yolks, cream, and stewed chicken liver. According to the relevant data, the content of vitamin D in the above foods is as follows Herring: 100g of herring contains 900IU of vitamin D. Egg yolks: 100g of egg yolks contain 158IU of vitamin D. Cream: 100g of cream contains 100IU of vitamin D. Stewed chicken livers: 100g of stewed chicken liver contains 67IU of vitamin D. In addition, moderate sun exposure can enable the body to synthesize its own vitamin D. If you suspect a vitamin D deficiency, you need to consult a doctor to check your blood vitamin D levels and use vitamin D supplements under the guidance of your doctor, rather than taking unauthorized medication.