Selenium

Definition

Selenium is a trace mineral that is essential for maintaining health and preventing disease in humans.

Scientific / Technical Definition

Selenium is a micronutrient that plays a crucial role in the body's antioxidant defenses, immune function, and thyroid hormone metabolism. It is an integral part of selenoproteins that protect cells from oxidative damage and support overall health.

Benefits

• Supports immune system function
• Acts as an antioxidant, reducing oxidative stress
• Promotes thyroid health
• May lower the risk of certain types of cancers
• Supports cardiovascular health

Examples

• Brazil nuts
• Sunflower seeds
• Brown rice
• Eggs
• Chicken
• Fish (such as tuna, sardines, and salmon)

Additional Information

• Known issues: Consuming too much selenium can lead to selenosis, a condition that causes symptoms such as hair loss, gastrointestinal issues, and neurological abnormalities.

Related Terms

• Antioxidants
• Thyroid function
• Micro-nutrients
• Trace elements

References

• Selenium - Health Professional Fact Sheet
• Selenium in Human Health and Disease
• Selenium - Harvard T.H. Chan School of Public Health