Calcium carbonate D3 granules are usually best taken half an hour after meals and at bedtime. Calcium carbonate D3 granules are mainly used for the prevention and treatment of diseases caused by calcium and vitamin D deficiency, and are generally best taken after meals and before bedtime. After eating, more gastric acid is secreted in the body, which makes the calcium carbonate in calcium carbonate D3 granules easier to be decomposed and absorbed, and the calcium intake mixed with food increases the contact area with the gastrointestinal tract, which can more effectively help the absorption of calcium in the gastrointestinal tract. Since human blood calcium levels are lowest in the latter part of the night and early morning, taking calcium carbonate D3 granules before bedtime helps better absorption of calcium. It should be noted that too much calcium supplementation may cause constipation or hypercalcemia and other diseases. It is usually recommended to consume milk and other foods to supplement calcium. Calcium supplementation is recommended to be applied under the guidance of a doctor and not to be used blindly on your own.