1. Functions
- Essential for utilization of calcium and phosphorus, which are necessary for healthy bones and teeth, and to keep in good condition our nervous system.
- Maintains adequate levels of calcium in the blood.

2. Where to find it?
In part they formed in skin by the action of sunlight (ultraviolet) and partly to be taken with food. Foods rich in vitamin D are oily fish, fish liver oil, margarine, eggs, milk and dairy products.

3. Nutritional Needs
The RDAs are 5 micrograms / day (depending on sun exposure).

4. What is missing?
Its deficiency can cause rickets or osteomalacia.

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