Multivitamin and Selenium: Can You Take Them Together?

Use caution — significant interaction

Multivitamin and Selenium can interact. Combined selenium intake from multivitamin plus standalone selenium supplement can approach or exceed the 400 mcg/day UL, risking selenosis symptoms. The SELECT trial documented increased T2DM risk at 200 mcg/day in selenium-adequate men. Do not add standalone selenium supplementation to a multivitamin unless selenium deficiency is confirmed via serum selenium testing. Total selenium from all supplement sources should remain below 400 mcg/day. Most individuals in developed nations with adequate dietary intake do not benefit from supplemental selenium above 55–100 mcg/day.

What the evidence says

majorconflict· strong evidence

Multivitamins contain 55–200 mcg selenium (near to at RDA of 55 mcg; some formulas reach 200 mcg). The tolerable upper intake level for selenium is 400 mcg/day. Selenium toxicity (selenosis) occurs above chronic intakes of 400–900 mcg/day. Selenium excess causes garlic breath, nail brittleness, hair loss, peripheral neuropathy, and cardiac effects. High-dose selenium increases type 2 diabetes risk (SELECT trial: 200 mcg/day increased T2DM risk in selenium-replete men).

What to do: Do not add standalone selenium supplementation to a multivitamin unless selenium deficiency is confirmed via serum selenium testing. Total selenium from all supplement sources should remain below 400 mcg/day. Most individuals in developed nations with adequate dietary intake do not benefit from supplemental selenium above 55–100 mcg/day.

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Frequently asked questions

Can you take Multivitamin and Selenium together?: Multivitamin and Selenium can interact. Combined selenium intake from multivitamin plus standalone selenium supplement can approach or exceed the 400 mcg/day UL, risking selenosis symptoms. The SELECT trial documented increased T2DM risk at 200 mcg/day in selenium-adequate men. Do not add standalone selenium supplementation to a multivitamin unless selenium deficiency is confirmed via serum selenium testing. Total selenium from all supplement sources should remain below 400 mcg/day. Most individuals in developed nations with adequate dietary intake do not benefit from supplemental selenium above 55–100 mcg/day.
Do Multivitamin and Selenium interact?: Combined selenium intake from multivitamin plus standalone selenium supplement can approach or exceed the 400 mcg/day UL, risking selenosis symptoms. The SELECT trial documented increased T2DM risk at 200 mcg/day in selenium-adequate men. Multivitamins contain 55–200 mcg selenium (near to at RDA of 55 mcg; some formulas reach 200 mcg). The tolerable upper intake level for selenium is 400 mcg/day. Selenium toxicity (selenosis) occurs above chronic intakes of 400–900 mcg/day. Selenium excess causes garlic breath, nail brittleness, hair loss, peripheral neuropathy, and cardiac effects. High-dose selenium increases type 2 diabetes risk (SELECT trial: 200 mcg/day increased T2DM risk in selenium-replete men).
Should you separate Multivitamin and Selenium?: Do not add standalone selenium supplementation to a multivitamin unless selenium deficiency is confirmed via serum selenium testing. Total selenium from all supplement sources should remain below 400 mcg/day. Most individuals in developed nations with adequate dietary intake do not benefit from supplemental selenium above 55–100 mcg/day.

This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.

What the evidence says

majorconflict· strong evidence

Frequently asked questions

Can you take Multivitamin and Selenium together?

Do Multivitamin and Selenium interact?

Combined selenium intake from multivitamin plus standalone selenium supplement can approach or exceed the 400 mcg/day UL, risking selenosis symptoms. The SELECT trial documented increased T2DM risk at 200 mcg/day in selenium-adequate men. Multivitamins contain 55–200 mcg selenium (near to at RDA of 55 mcg; some formulas reach 200 mcg). The tolerable upper intake level for selenium is 400 mcg/day. Selenium toxicity (selenosis) occurs above chronic intakes of 400–900 mcg/day. Selenium excess causes garlic breath, nail brittleness, hair loss, peripheral neuropathy, and cardiac effects. High-dose selenium increases type 2 diabetes risk (SELECT trial: 200 mcg/day increased T2DM risk in selenium-replete men).

Should you separate Multivitamin and Selenium?

Do not add standalone selenium supplementation to a multivitamin unless selenium deficiency is confirmed via serum selenium testing. Total selenium from all supplement sources should remain below 400 mcg/day. Most individuals in developed nations with adequate dietary intake do not benefit from supplemental selenium above 55–100 mcg/day.