Minerals
Selenium — timing, dose & interactions
Built into selenoproteins such as glutathione peroxidase and the deiodinases that activate thyroid hormone. Two Brazil nuts can exceed a typical supplement dose.
Timing
When to take it
Any time. The margin between enough and too much is narrow — don't stack multiple sources.
Dose note. Adult UL. Chronic excess causes hair and nail loss (selenosis).
Interactions
Selenium with other supplements
Buying guide
What to look for on the label
Selenium
- Selenomethionine or selenium yeast
- Count selenium in your multivitamin too
FAQ
Common questions
When is the best time to take Selenium?
Breakfast or Lunch. Any time. The margin between enough and too much is narrow — don't stack multiple sources.
Should Selenium be taken with food?
It can be taken with or without food. Any time. The margin between enough and too much is narrow — don't stack multiple sources.
Can you take Selenium with Vitamin E?
Yes, at moderate doses — but high doses of either haven't prevented cancer. Stick to modest doses; don't megadose for cancer prevention.
Can you take Selenium with Iodine?
Yes — the thyroid needs both, but don't exceed either upper limit. Keep doses moderate. With thyroid disease, involve your doctor.
Sources