Calcium can be taken together with vitamin D. Calcium can maintain the body’s muscle, nerve, skeletal system, capillary permeability, and is a trace element needed to maintain normal body function. Vitamin D can participate in the metabolism of calcium and phosphorus, promote calcium absorption, and is also important for bone formation. Calcium deficiency in the human body can lead to poor sleep, physical weakness, back pain, leg cramps and other performance. Calcium deficiency in adolescents and children can be manifested as difficulty in sleeping, sweating, night sweats and other symptoms, can go to the hospital for trace element examination, if it is determined that the calcium deficiency caused by calcium, can be properly supplemented by calcium, when taking with their own needs with vitamin D. Daily diet should be a comprehensive and balanced nutrition, avoid picky eating, eat more calcium food, common bone broth, lean meat or milk, often eat fresh vegetables, fruits, and develop good habits.