The RDA in the United States lists 400 mcg of selenium per day as the upper limit, while a study done in China found signs of toxicity at doses of 900 mcg
These options have different evidence bases, mechanisms, and adverse-effect profiles from KLOW
doi: 10.1186/1476-9255-6-28
The German Nutrition Society (DGE) provides recommendations on how much this should be each day
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Consulting a healthcare professional can also provide personalized recommendations