The effect of calcium supplementation is better in spring and summer. In spring and summer, sunshine is long and ultraviolet rays are strong, and the body can synthesize active vitamin D under ultraviolet radiation, which helps calcium absorption. If it is winter, due to shorter sunshine and weaker ultraviolet rays, the body can synthesize less active vitamin D, and the absorption of calcium will be poorer. Generally speaking, in order to promote calcium absorption, it is recommended to sunbathe for 20 minutes to 30 minutes, depending on the strength of the sunlight and the duration of sunbathing. During the period of calcium supplementation, it is also necessary to consume calcium-rich foods, such as soy products, dairy products and vegetables. It is especially important to note that calcium supplementation through sunbathing has a limited effect and cannot be used to treat diseases. When the organism has discomfort symptoms related to calcium deficiency, it should consult a doctor in time, and under the guidance of the doctor for calcium supplementation treatment.