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Excess Vitamin D doesn't do anything (within reason), but the immune system doesn't work properly when you're vitamin D deficient, and this is something we can measure. Humans haven't evolved for an entirely indoor lifestyle, and we need daily direct sunlight in order to function properly.

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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-...

[1] https://ods.od.nih.gov/factsheets/VitaminD-Consumer/

[2] https://www.healthline.com/nutrition/how-much-vitamin-d-is-t...

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