Originally Posted by
OBoile
One arm for 10-15 minutes seems very low. Particularly for people with darker skin. Do you have anything to back this up.
When I've had blood work they have told me my Vitamin D is low. When I ask how, given how many hours I spend in the sun, they say people who get a lot of sun sometimes tend to be low on D. I don't know the process but I have heard this more than once.