Vitamin D

Definition

Vitamin D is a fat-soluble vitamin that helps your body absorb calcium and is crucial for bone health.

Scientific / Technical Definition

Vitamin D refers to a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and multiple other biological effects. It is bioavailable in several forms, with Vitamin D2 (ergocalciferol) and Vitamin D3 (cholecalciferol) being the most important in humans.

Benefits

• Supports bone health and development
• Aids in the absorption of calcium and phosphorus
• Boosts immune system function
• May play a role in reducing the risk of chronic diseases such as heart disease
• Potentially influences mood and reduces the risk of depression

Examples

• Fortified foods such as milk and cereal
• Fatty fish like salmon, mackerel, and sardines
• Egg yolks
• Cod liver oil
• Sunlight exposure, which helps skin synthesize vitamin D

Additional Information

• Importance: Vitamin D is important for maintaining healthy bones and teeth, supporting immune, brain, and nervous system health, and regulating insulin levels.

Related Terms

• Calcium
• Bone Health
• Supplements
• Nutrient Absorption
• Immunity

References

• Vitamin D: Fact Sheet for Health Professionals
• Vitamin D and Health: Background on Vitamin D and Health
• The role of vitamin D in the prevention of coronavirus disease 2019 infection and mortality