Hi,
I haven't had my Vit D levels checked, but the pharmacist says we need more in Winter, begin in Autumn, maximum dose in Winter then taper down in Spring then stop in Summer. I live in New Zealand so get plenty of sun in Summer. I also walk a lot so get a good amount throughout the year too.
My pharmy is a young guy with Crohns Disease (inflammation of small intestine) and he uses this regime.
Lesley x