Experts now generally agree that the best time to take calcium supplements is just before bedtime for both growing children and elderly people with osteoporosis. For growing children, the role of calcium supplementation before bedtime is to hinder the adoption of bone calcium in the body and provide calcium sources for calcium regulation at night; at the same time, calcium is related to the stability of plant nerves, and the body can play the effect of maximum bioavailability of calcium atoms and calcium elements. As for the elderly, calcium supplementation before bedtime also has a sedative effect, which helps sleep, facilitates adequate digestion and absorption, and delays osteoporosis. In addition, for people who need calcium supplements, they also need to develop good dietary and lifestyle habits. Eat more calcium-rich foods such as shrimp, milk, soybeans and tofu. In addition, it is best for the elderly to get sunlight, drink two glasses of milk and do proper exercise every day.