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What Role Does Selenium Play in Protecting Immune Cells?

Your immune system keeps your body healthy by identifying and fighting off potential threats. These include bacteria, viruses, and parasites.
Selenium plays an important role in the health of your immune system. This antioxidant helps lower oxidative stress in your body, which reduces inflammation and enhances immunity.
Studies have demonstrated that increased blood levels of selenium are associated with enhanced immune response.
On the other hand, deficiency has been shown to harm immune cell function and may lead to a slower immune response.

Studies have also associated deficiency with an increased risk of death and disease progression in people with HIV, while supplements have been shown to lead to fewer hospitalizations and an improvement in symptoms for these patients

Additionally, selenium supplements may help strengthen the immune system in people with influenza, tuberculosis, and hepatitis C

Best dietary sources of selenium
Fortunately, many healthy foods are high in selenium. The following foods are great sources:

(Oysters: 238% of the Daily Value (DV) in 3 ounces (85 grams), Brazil nuts:174% of the DV in one nut (5 grams), Halibut: 171% of the DV in 6 ounces (159 grams), Yellowfin tuna: 167% of the DV in 3 ounces (85 grams), Eggs: 56% of the DV in 2 large eggs (100 grams), Sardines: 46% of the DV in 4 sardines (48 grams), Sunflower seeds: 27% of the DV in 1 ounce (28 grams), Chicken breast:12% of the DV in 4 slices (84 grams), Shiitake mushrooms:10% of the DV in 1 cup (97 grams)
In Summary: Selenium is crucial for the health and proper functioning of your immune system.

Adequate selenium levels may help boost the immune system and the resistance against viral diseases of people with HIV, hepatitis C, diabetes, influenza, and respiratory diseases such as asthma, tuberculosis, etc. hepatitis C. ​Adding or supplementing more selenium to your diet is an excellent way to maintain good health.