Myths vs facts: Selen and gut health

Selenium is an essential trace element that acts as a cofactor for selenoproteins with antioxidant and anti-inflammatory properties. Some research suggests a potential role in gut health, including modulation of the gut microbiome and protection of intestinal barrier function. However, the evidence is limited: most studies are preclinical or small human trials with inconsistent results. A common myth is that selenium supplements can cure gut disorders like IBS or Crohn's disease – there is no strong clinical evidence for this. Another myth is that more selenium is always better. In reality, selenium has a narrow therapeutic window; excess intake (selenosis) can cause gastrointestinal upset, hair loss, and neurological issues. The recommended daily intake is about 55–70 µg for adults; supplementation should only be considered after confirmed deficiency or under medical supervision. Blood or stool tests (e.g., for selenium levels) are more actionable than DNA tests. Bottom line: selenium is relevant for gut health, but myths exaggerate its benefits. Evidence is rated as 'mixed'.