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by tekgnos 2150 days ago
Studies of pale skinned Norwegiens who go in the sun during summer show they make 10,000-20,000IU equivalent a day. Results will vary depending on skin tone and the position of the sun (lower in the sky means no vitamin D as the right wavelengths of light are not hitting your skin)

https://www.healthline.com/nutrition/vitamin-d-from-sun#time...