Data on Vitamin D from Sunlight

[Guest guest]

Hi folks:

The number of minutes it takes for an untanned, full-body, caucasian

exposure to summer sun to create the maximum practical daily dose of

cutaneous vitamin D is supposed to be a long way short of how long it

takes to see any visible effects on the skin (tan or

burn, 'suberythematic').

I have been looking for, and have not yet tripped over, data for how

long this full vitamin D dose exposure time is. And to the extent it

varies by latitude, very approximately by how much.

If anyone knows where this data can be found I would very much

appreciate a reference/link.

Thank you.

Rodney.