Trace minerals
Selenium
Thyroid · antioxidant
Glutathione peroxidase, thyroid hormone metabolism.
Upper-limit caution
The Tolerable Upper Intake Level for Selenium is 400 mcg per day. Routine intakes above this level — counting food + supplements — raise the risk of adverse effects. Multivitamins, fortified foods, and standalone supplements stack faster than people expect.
How Selenium appears on labels
Supplement labels list Selenium under several names depending on the chemical form used. Any of these on an ingredients panel counts toward your Selenium intake:
- selenium
- selenomethionine
- l-selenomethionine
- sodium selenate
Deep dive
For mechanism of action, dosing protocols, evidence grade, and interaction warnings on Selenium, see the full encyclopedia entry:
Selenium encyclopedia entry →Related trace minerals
Track your full intake
Formulate's free desktop app aggregates Selenium (and ~40 other nutrients) across every supplement in your stack — flagging underdoses, overlaps, and upper-limit overshoots in one view.
Get the appMedical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Targets and upper limits are general adult reference values; individual needs vary by age, sex, pregnancy status, and clinical context.