I still think it's aliens!!

Oh, Mrs. D, one quick question, off topic but on a topic we discussed on another forum, but since I'm here right not, I just want to know something.

Can a person sit by a window that is in direct sunlight and get Vitamin D (without going outside). For example, if it's 2 degrees outside, but the sun is shining, can Alan go and sit by the Living Room window and get his Vitamin D that way.

I got him out today and it was lovely outside.

Thanks much
Mel