Do you know the best ways to supplement calcium for the elderly?

The elderly are osteoporosis caused by calcium deficiency. It is recommended to eat more high calcium foods such as dairy products and bean products, and eat more foods such as spinach, soybeans, fish and kelp. Get more sunshine to promote calcium absorption. If calcium deficiency causes severe leg pain, back pain and fatigue, I still need to take some calcium. Like my grandmother, she is eating Lin Yuzhi Youren Chicken now and going to square dance every night. She is very strong.