Health care, also known as taking health care, moral education, nourishing, hygiene, health preservation, longevity and so on. , refers to the floorboard of methods such as preventing before illness, making people light and strong, hearing and seeing, Zhi Ming, cultivating temperament, physical and mental health and prolonging life, covering all aspects from diet and daily life to drug bait conditioning. The purpose of health preservation is "health", "happiness" and "longevity". Therefore, all theories and methods that make people healthy, happy and live longer are called health preservation. Colla Corii Asini is sweet in taste and flat in nature, and can replenish blood and nourish blood, stop bleeding, nourish yin and moisten dryness, invigorate qi and tonify deficiency, dispel wind and resolve phlegm, clear away lung heat and diuresis, and moisten large intestine. It has a good curative effect on dizziness, palpitation, sallow and emaciated, numbness of limbs, lung dryness, cough and various bleeding syndromes caused by blood deficiency, constipation caused by intestinal dryness in the elderly and infirm, insomnia caused by yin deficiency, etc. According to Shennong's Classic of Materia Medica, Ejiao can "lead the heart to collapse, fatigue like malaria, waist and abdomen pain, limb pain ...", which reflects the extraordinary limbs. Modern research also believes that Ejiao is an important medicine for nourishing yin and enriching blood in traditional Chinese medicine, which has a certain effect on the hematopoietic function of bone marrow, can quickly restore red blood cells of hemorrhagic anemia, has a strong blood-enriching effect, and can enhance the immune function of the body, slow the growth of tumors, improve symptoms and prolong life. Ejiao can also reduce the oxygen consumption of the body, and has anti-fatigue and anti-aging effects. It has a certain protective effect on organ dysfunction, low immune function, bone marrow hematopoietic dysfunction and bleeding for various reasons in the elderly, thus contributing to the health care and longevity of the elderly.