First, it's best to take it with vitamin D. Why do doctors tell you to get more sunshine when taking calcium tablets? Because more sun exposure can promote the synthesis process of vitamin D in human body, the existence of vitamin D can promote the utilization and absorption efficiency of calcium in human body. Second, we must pay attention to eating on time and in quantity. In order to make it easier and better for everyone to understand, Bian Xiao shared the gnc calcium citrate tablets in the United States as an example. When eating, if you can take another tablet of gnc vitamin D every day, the effect of calcium supplementation will be better. On the other hand, because this calcium citrate contains a lot of calcium, if you want to prevent some diseases such as osteoporosis, you can take one tablet every day. If you are an elderly person with severe osteoporosis, you can take one tablet twice a day. The above is Bian Xiao's answer about how to eat calcium citrate in the United States. It should be reminded that there are many brands of calcium citrate tablets from the United States, and the calcium content of each tablet is different, so the dosage taken every day is also different, which should be noted.