Going under the sun to get enough vitamin D is not BS... it's
real...

Your UV Light is produced by the sun... the sun activates the
inactivated vit D to the active form - Vit D3, this travels to the
liver and gets hydroxylated to 25-DHCC and then into the kidneys to
become either the active vit D - 1,25-DHCC or the inactive form -
24,25-DHCC...