It is perfectly fine to take calcium tablets half an hour after a meal, while a reasonable amount of vitamin D supplementation may be more effective. Calcium tablets are mainly supplemented in the form of calcium carbonate for the treatment and prevention of calcium deficiencies, such as bone dysplasia, calcium deficiency in women during pregnancy, osteoporosis, calcium supplementation for lactating women and the elderly, etc. Now the more common calcium carbonate D3 on the market, it was originally a complex preparation, both to supplement vitamin D and reasonable calcium supplementation, so that the body can better have calcium absorption. Calcium absorption is more in the premise of dietary structure adjustment, it is best to get calcium supplement from the dietary structure, for example, you can eat more calcium-containing foods, such as tofu, fresh vegetables, milk, etc., to increase the amount of these diets, so as to better play the role of calcium supplementation and promote calcium absorption. Under the premise of dietary structure adjustment, if there is osteoporosis or calcium deficiency in pregnant women or lactating women, you can additionally add calcium tablets as a supplement and take them half an hour after meals for better effect.