Vitamin D is a vitamin. Vitamin D controls the levels of calcium ions and phosphates in the blood in the intestines. It helps bones grow and form. It is also good for the immune system. In total, there are 5 vitamins, D1 to D5. The most common ones are D2 and D3 (see image). It is in fish-liver oils and fortified milk. If a person lacks vitamin D, then that person will have rickets and soft bones.
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