Selenium May Protect Against Cancer, Diabetes, and Aging.

A 2025 review in Nutrients by Zhang dives into the crucial roles selenium plays in our bodies. As a key part of selenoproteins, this micronutrient helps balance redox reactions, regulate cell growth, support the immune system, and guard against DNA damage, chronic inflammation, insulin resistance, and neurodegeneration.

Deficiencies in selenium have been linked to higher risks of cancer, type 2 diabetes, cognitive decline, and accelerated aging, while proper intake supports DNA repair, antioxidant defenses, thyroid function, and even reproductive health.

Add selenium-rich foods—seafood, organ meats, whole grains, and mushrooms—or consider a balanced multivitamin to hit the 55–200 μg/day range. Your immune system, metabolism, and brain will thank you.