TimingSelenium

Anytime, stay consistent

When to take Selenium

Anytime, with food

Selenium supports thyroid hormone, immunity and antioxidant enzymes. The window between enough and too much is narrow.

Updated 2026-10-25

Best time in your day

Any time of day: pick a time that suits you and keep it the same every day.

When
Anytime, with food
Food
With food
Typical dose
55 mcg is the daily need; supplements 50–200 mcg; upper limit 400 mcg

How to take it

  1. 1Count selenium in your multi
  2. 2Take it with a meal
  3. 3Watch Brazil nuts (one can contain over 50 mcg)
  4. 4Stay below 200 mcg unless advised

Watch out

Too much causes brittle nails, hair loss and garlic breath.

Keep apart from

  • Other selenium products

Common questions

Is it good for the thyroid?

It's needed for converting thyroid hormone; studied in Hashimoto's.

Do Brazil nuts count?

Yes, they vary hugely.

Do vegetarians need it?

Soil levels matter more than diet type.

Explore further

Commonly used for

Sources

  1. NIH Office of Dietary Supplements: Selenium fact sheet for health professionals

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For general education only, not medical advice. Talk to a qualified doctor before starting or changing supplements, especially if you are pregnant, nursing or on medication.