Low 25-hydroxyvitamin D is usually a sign of vitamin D deficiency, which should be corrected with sun exposure, oral vitamin D medication as prescribed by your doctor, and a diet rich in vitamin D-containing foods. 1.25 Hydroxyvitamin D is the main form of vitamin D in the human body, the test suggests that 25-hydroxyvitamin D is low, indicating that the human body vitamin D deficiency. For people who are deficient in vitamin D, they need to get more sunlight to promote vitamin D synthesis in their bodies. 2. At the same time, under the guidance of a doctor to take vitamin D, for the prevention and treatment of vitamin D deficiency. It is important to note that long-term overdose of vitamin D may be toxic. Vitamin D is contraindicated for people with vitamin D hyperplasia and hypercalcemia. 3. It is also necessary to strengthen the nutritional intake, eat more food containing vitamin D, such as herring, salmon, sardines, pig liver, chicken liver, sheep liver, eggs and so on. It is recommended to eat a reasonable diet and correct the habits of partiality and picky eating. Meanwhile, going out in the sun more often can promote the synthesis of vitamin D in the human body.