Calcium crystal. Blue bottle calcium is Sanjing brand calcium gluconate oral liquid. Its main function is to supplement calcium. In winter in the north, the weather is cold. If the blue bottle of calcium is not well preserved, the calcium molecules in the liquid will condense into white calcium crystals. You can scald the blue bottle of calcium in warm water, and the calcium crystals will disappear without affecting eating. Blue bottle calcium, iron and zinc oral liquid is a kind of health food and a good choice for children to supplement calcium, iron and zinc. It is convenient to use and can effectively promote children's growth and intellectual development. Blue bottle products are safer with blue hat certification.