Our most current understanding is that 7k iu is closest to optimal, and that previous recommendations were based on bad math. https://www.ncbi.nlm.nih.gov/pmc/

Our most current understanding is that 7k iu is closest to optimal, and that previous recommendations were based on bad math. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541280/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5541280/ While toxicity is a serious matter, the actual risk is generally overblown, since it requires truly heroic, sustained doses. >The evidence is clear that vitamin D toxicity is one of the rarest medical conditions and is typically due to intentional or inadvertent intake of extremely high doses of vitamin D (usually in the range of 50,000-100,000 IU/d for months to years) https://www.mayoclinicproceedings.org/article/S0025-6196(15)00244-X/pdf https://www.mayoclinicproceedings.org/article/S0025-6196(15)...