Vitamin D

Definition

Vitamin D is a nutrient that helps the body absorb calcium, which is essential for maintaining strong bones and teeth.

Scientific / Technical Definition

Vitamin D refers to a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and for maintaining proper bone structure. It can be synthesized in the skin from cholesterol through a chemical reaction that is dependent on sun exposure (specifically UVB radiation).

Benefits

• Supports bone health by aiding in the absorption of calcium and phosphorus.
• Boosts immune system function.
• Reduces inflammation.
• Potentially lowers the risk of certain diseases, including multiple sclerosis and heart disease.

Examples

• Fatty fish such as salmon and mackerel
• Fortified foods like milk, cereal, and orange juice
• Egg yolks
• Cheese

Additional Information

• Importance: Vitamin D is important during pregnancy for proper bone development of the fetus and to support the mother's immune health.

Related Terms

• Calcium
• Osteoporosis
• Rickets
• Sun exposure

References

• Vitamin D Fact Sheet for Consumers
• Health benefits of Vitamin D