Is Selen useful for Langlebigkeit?

Selenium is an essential trace mineral that functions as a cofactor for selenoproteins, including glutathione peroxidases and thioredoxin reductases, which protect against oxidative stress and support thyroid function. Some observational studies have linked adequate selenium status to reduced all-cause mortality and lower risk of age-related diseases such as cardiovascular disease and certain cancers. However, randomized controlled trials have yielded mixed results: while correcting deficiency appears beneficial, selenium supplementation in well-nourished populations may increase the risk of type 2 diabetes and some cancers. The provided context lacks any direct studies on selenium and longevity, making the evidence unclear. Therefore, a general recommendation for selenium supplementation to promote longevity cannot be justified. Instead, individuals should assess their selenium status via blood tests (e.g., plasma selenium or selenoprotein P) before considering supplements. Dietary sources such as Brazil nuts (one nut can provide the daily requirement), fish, eggs, and organ meats are generally sufficient. Caution is warranted because selenium has a narrow therapeutic window; excessive intake can lead to selenosis, characterized by hair loss, nail brittleness, and neurological symptoms. In summary, while selenium is vital for health, the evidence for its role in extending lifespan is insufficient and context-dependent.