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Immunité et nutrition

Selenium and Immunity

Selenium is vital for immune cell antioxidant protection and thyroid function.

Definition

A trace mineral that is incorporated into selenoproteins, which play essential roles in antioxidant defense and immune cell function. It works synergistically with vitamin E.

How it works

Selenium is a key component of selenoproteins, particularly glutathione peroxidase and thioredoxin reductase, which protect immune cells from oxidative stress. This protection is crucial because oxidative damage can impair immune cell function and promote inflammation. Selenium also supports thyroid hormone metabolism, which is important for immune regulation and metabolic health. The mineral enhances the proliferation of T cells and the production of antibodies, strengthening both cellular and humoral immunity. Selenium deficiency is associated with increased viral susceptibility and impaired immune responses, particularly against respiratory pathogens.

Role

Provides antioxidant protection for immune cells and supports thyroid-mediated immune regulation.

Examples

  • Brazil nuts
  • Tuna and other seafood
  • Chicken
  • Eggs
  • Whole grains

Recommendations

Aim for 55 micrograms daily through food sources like seafood and whole grains. Brazil nuts are exceptionally rich in selenium, but consume moderately (1-3 per day) as excessive intake can be toxic. Ensure adequate vitamin E intake to enhance selenium's protective effects.

Key takeaway

Selenium protects immune cells from oxidative damage and supports robust immune responses.

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