I do 5000 IU per day. NIH recommends 600 IU for most people [1]. The Institute of Medicine says 4k IU as the safe upper level of daily intake. Vitamin D does w

I do 5000 IU per day. NIH recommends 600 IU for most people [1]. The Institute of Medicine says 4k IU as the safe upper level of daily intake. Vitamin D does wonders for my skin. Not once did a dermatologist suggest I could be deficient. I figured it out on my own. Here is a good resource for research on vitamins and minerals and their applications: https://www.informationisbeautiful.net/visualizations/snake-oil-scientific-evidence-for-nutritional-supplements-vizsweet/ https://www.informationisbeautiful.net/visualizations/snake-... [1] https://ods.od.nih.gov/factsheets/VitaminD-Consumer/ https://ods.od.nih.gov/factsheets/VitaminD-Consumer/ [2] https://www.healthline.com/nutrition/how-much-vitamin-d-is-too-much#section2 https://www.healthline.com/nutrition/how-much-vitamin-d-is-t...