Indigenous people evolved latitude appropriate skin color for living outdoors near naked.
Full body sun exposure produces approximately 1000iu/vitamin d3 every 5 mins. 20~30 minutes full body, non burning sun exposure at midday, when the ratio of UVB<>UVA is best, produces around 5000iu at such intakes most people achieve a natural 25(OH)D status around 55ng.~ 137.5nmol/l
Participating in the
"Grassrootshealth.org D Action"
trial enables people to have regular checks at cost price
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