Selenium is beneficial for cell protections, lowering cancer risk and helping in the treatment of AIDS, according to Healthline. Selenium is also potentially beneficial for asthma, arthritis, dandruff and infertility, claims WebMD.
Selenium is a mineral found in soil, water and certain foods. Selenium deficiencies are rare in healthy people, but those with HIV or Crohn's disease sometimes have low selenium levels, claims WebMD.
The body uses selenium to work as antioxidants by turning harmful chemicals in the body into water. A study of over 9,000 people showed that low selenium levels are associated with an increased risk of lung cancer, especially among smokers. As for HIV, one study found that selenium supplements drastically lowered hospitalization rates and decreased progression of the virus, claims Healthline.