Top Food Sources with Selenium
Selenium in food is an essential trace mineral that plays a key role in many physiological functions, including:
Antioxidant protection (through selenoproteins like glutathione peroxidase)
Thyroid hormone metabolism
Immune system support
DNA synthesis
Foods High in Selenium
The amount of selenium in food depends heavily on the selenium content of the soil where the food was grown or raised.
Top Sources of Selenium:
Food Typical Selenium Content (per serving)
Brazil nuts (1 nut) 68–91 mcg (well over 100% DV)
Tuna (cooked, 3 oz) ~90 mcg
Sardines (canned, 3 oz) ~45 mcg
Shrimp (3 oz) ~40 mcg
Eggs (1 large) ~15 mcg
Chicken (roasted, 3 oz) ~22–25 mcg
Beef (3 oz) ~18–28 mcg
Brown rice (1 cup cooked) ~19 mcg
Sunflower seeds (1 oz) ~19 mcg
Whole wheat bread (1 slice) ~10 mcg
Recommended Dietary Allowance (RDA) for selenium:
Adults: 55 micrograms/day
Tolerable Upper Intake Level: 400 micrograms/day (excess can be toxic)
⚠️Selenium Toxicity (Selenosis)⚠️
Too much selenium—especially from supplements or Brazil nuts—can lead to:
Nausea
Hair loss
Nail brittleness
Fatigue
Nerve damage
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