Here is the study: https://pubmed.ncbi.nlm.nih.gov/20363523/ https://pubmed.ncbi.nlm.nih.gov/20363523/ It would take roughly an hour per day of exposure to 25

Here is the study: https://pubmed.ncbi.nlm.nih.gov/20363523/ https://pubmed.ncbi.nlm.nih.gov/20363523/ It would take roughly an hour per day of exposure to 25% of the skin in summer midday sun to get 5000IU (depending on skin type and UV index). The article seems to be conflating correlation with causation.