How are Selen and longevity related?

The relationship between selenium and longevity is not yet fully established in science. Selenium is an essential trace element that acts as a component of selenoproteins (e.g., glutathione peroxidases) with antioxidant functions, and it supports thyroid health and immunity. Some observational studies suggest a positive link between adequate selenium status and reduced mortality, especially in older adults. However, randomized controlled trials do not consistently show a benefit of selenium supplementation for extending lifespan; high doses can even be toxic (selenosis). The evidence is therefore best described as 'mechanistic' to 'unclear'. The provided context does not contain specific information on selenium; it covers other genes (APOA1, CLOCK, MAOA, APOE, APOA5) and microbiome tests. For a reliable assessment of selenium and longevity, direct studies or guidelines would be needed. Consumers should not rely solely on genetic tests or supplements but aim for a balanced diet. When in doubt, consult a healthcare professional.