I've been supplementing with Vitamin D for years now since I tested low by my doctor. I get plenty of sun exposure but for some reason I'm always low. Maybe bec

I've been supplementing with Vitamin D for years now since I tested low by my doctor. I get plenty of sun exposure but for some reason I'm always low. Maybe because of sun screen? In any case, every once in a while I'll stop taking it and usually end up feeling like garbage. I think it's the only vitamin where I have ever experienced that.