Thorne Selenium

Selenium is required to convert T4, the storage form of thyroid hormone, into T3, the active form your metabolism actually runs on, which makes this small trace mineral disproportionately tied to how efficiently your body converts food into usable energy. Your body doesn't produce selenium on its own, so it has to come entirely from diet or supplementation.

Thorne's Selenium delivers 200mcg of selenium bound to methionine, the same form selenium takes naturally in food, in a single daily capsule.

Supports thyroid hormone conversion – Selenium is a required cofactor for the enzyme that converts T4 into active T3, tying it directly to metabolic rate and energy availability.

Supports your body's own antioxidant defenses – Selenium is a core component of glutathione peroxidase, one of your body's primary antioxidant enzyme systems, relevant to the oxidative stress that comes with hard training.

Well-absorbed, minimal-ingredient formula – Bound to methionine rather than an inorganic form like selenite, with just microcrystalline cellulose and a plant-based capsule shell beyond the active ingredient.

Selenium gets incorporated into a family of proteins called selenoproteins, which include glutathione peroxidases and the thyroid deiodinase enzymes responsible for that T4-to-T3 conversion. Selenomethionine specifically absorbs and retains in tissue more effectively than inorganic selenium forms, which is part of why it's the form naturally found in selenium-rich foods like Brazil nuts and fish. Selenium status has also been studied for its role in normal immune response and cellular protection against oxidative damage.

How to Use Thorne Selenium

Dose: Take one capsule once daily, preferably with food if you find that more comfortable.

Note: Talk to your healthcare provider before adding this, since selenium plays a direct role in thyroid hormone metabolism and could interact with how your medication is dosed.