Serum Level by Sun Exposure Amount for Non-Supplement Takers
This chart shows average 25(OH)D levels (ng/ml) for non supplement takers based on average daily amount of time spent outdoors with sun exposed skin between 10am to 2pm during the prior 6 months.
In D*action participants who reported taking no vitamin D supplements, vitamin D serum levels rose by about 1.2 ng/ml for each additional 15 minutes per day spent outdoors in the sun with exposed skin.
Of special note is that the 2-4 hour group (outdoor worker type) achieved the recommended 40 ng/ml (100 nmol/L) observed in outdoor worker populations.
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