Pairing calcium supplements with citrus fruits works better
Calcium readily binds with oxalic acid and phosphoric acid in vegetables and phytic acid in grains, forming a poorly soluble compound that is hard to absorb; calcium also readily binds with the fatty acids released from fat breakdown to form poorly soluble substances, affecting calcium absorption. Therefore, the best time to supplement calcium is before going to sleep at night or between two meals, because the blood calcium concentration in the...

Calcium readily binds with oxalic acid and phosphoric acid in vegetables and phytic acid in grains, forming a poorly soluble compound that is hard to absorb; calcium also readily binds with the fatty acids released from fat breakdown to form poorly soluble substances, affecting calcium absorption. Therefore, the best time to supplement calcium is before going to sleep at night or between two meals, because the blood calcium concentration is lowest in the second half of the night and in the morning, making this the best time to supplement calcium. Experts point out that in order to improve the effect of supplementing calcium through food, it is best to also eat foods rich in vitamin C, such as citrus fruits.