Doesn't that vary with the skin color (aka melanin content in the skin)? I presume as a brown person I need more exposure for an equivalent dose compared to a Caucasian person.
It's a builtin feature of us white folks to think everyone else is also white. /s
Ha :)
Yes it does, darker skinned persons in northerly climes are at higher risk of lower vit D than we pale skins with the equal level of exposures to the sun.