I really enjoyed the fact how informative of your post is, but I disagree with one thing about it. Vitamin D supplementation may be needed even for the "average" person, especially during winter time in Northern countries. At this time of the year it's practically impossible to get adequately sunlight for vitamin D synthesis, since sunlight isn't a self-evidence. Therefore many people suffer from vitamin D deficiency in winter. So, supplements aren't always that bad but rather beneficial. :)
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Yes you are right @jasmink. There are certain regions on this planet where the UV radiation may not be sufficient and then supplements may make sense (like Finland). However, there are some dietary sources and I do think it is better to fulfill your needs with natural sources first if possible. Also a lot of countries "fortify" butter and milk with vitamin D to ensure adequate vitamin D levels. Thank you for your elaborate post! Cheers!