The Claim
The tolerable upper intake level for selenium in adults is 400 micrograms per day, and physiological benefits occur at selenium intakes substantially below 400 micrograms per day.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Adults should not consume more than 400 micrograms of selenium per day, and the body's normal functions benefit from lower amounts of selenium.
See the scientific wording
The tolerable upper intake level for selenium in adults is 400 micrograms per day, with physiological benefits occurring at intakes substantially below this level.
The body uses selenium to make enzymes that control oxidation, but these enzymes work fully with very little selenium. More selenium than needed does not improve function and instead causes harmful chemical reactions that damage cells and disrupt metabolism.
What the research says
2 studiesStudy: Dietary Reference Intakes of Selenium for Chinese Residents.
This study says your body only needs about 60 micrograms of selenium a day to work properly, and eating more than 255 micrograms might increase your risk of diabetes — so the old safety limit of 400 micrograms is too high.
This study found that taking too much selenium (200 mcg or more per day) can hurt your cholesterol levels, but taking a little less might help. So, it supports the idea that you shouldn’t take more than 400 mcg a day, and your body works best with less.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 2 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.