01
Why supplement?
✓
Supports antioxidant defense
Selenium is a structural element of selenoproteins such as glutathione peroxidase.
Mechanism: Established✓
Supports thyroid metabolism
Selenoproteins are involved in thyroid hormone metabolism.
Nutrition consensus: EstablishedADVERTISEMENT
02
How to take it
With foodWith food
Best timeAnytime
Avoid using several selenium-containing products at the same time.
General wellnessAdults 55 mcg/day
Specific needsDeficiency or special thyroid uses must be decided by a doctor from lab tests; the adult upper limit is 400 mcg/day.
How oftenUse according to daily need; long-term self-exceeding of the upper limit is not recommended.
03
What to watch
Cautions
Excess selenium can be toxic; count Brazil nuts and multivitamins toward the total.
People with thyroid disease should not replace treatment with selenium on their own.
Common side effects
· Garlic breath
· Metallic taste or stomach upset (excess)
Rare but important
· Chronic excess can cause hair loss, brittle nails, and neurologic changes.
Long-term dependenceNot addictive; long-term excess carries a risk of selenium toxicity.