Rhonda Patrick· PhD
The Food and Nutrition Board of the Institute of Medicine conservatively set the tolerable upper intake level (UL) at 4,000 IU/day (100 μg/day) for all adults.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
The Food and Nutrition Board of the Institute of Medicine conservatively set the tolerable upper intake level (UL) at 4,000 IU/day (100 μg/day) for all adults.
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The safe upper limit for vitamin D supplementation is typically considered 4,000 IU per day
the National Institute for medicine in has set the upper tolerable intake at 4,000 IUS a day so I personally take 4,000 IUS a day
So, in terms of supplementation, though, you know, the upper tolerable intake that's been set by the Institute of Medicine has been 4000 IUs a day.