Nutrient

Selenium

Established research area

A trace mineral with antioxidant roles, notably concentrated in Brazil nuts and seafood.

Commonly noted

Commonly noted: Selenium is a trace mineral the body builds into antioxidant proteins and uses in thyroid hormone metabolism.
Low intake: Low selenium status is uncommon in most regions and is commonly discussed in relation to areas where soil selenium is very low.
Higher intake: Very high selenium is commonly discussed in relation to brittle hair and nails, a garlic-like breath odor, and digestive upset (a state called selenosis); the commonly cited upper intake level for adults is 400 mcg a day, and just a few Brazil nuts can supply a large amount.

Source: NIH ODS

Reference intakes

General reference figures for a typical adult — not a personal target or a claim of need.