I originally wrote this article in 2013, and I’ve updated it annually with more research and to stress it’s importance in immunity. The COVID pandemic made it crystal clear we all need to maintain healthy levels, as our ancestors were outside, without sunscreen routinely. Do you know you can make your own D? All you need is skin, sun and no sunscreen (read on…) Everyone should take a Vitamin D supplement.  Yes I said EVERYONE. Why?  There are multiple reasons.  Optimizing your vitamin D levels should be at the top of the list for virtually everyone, regardless of your age, sex, color, or health status, as vitamin D deficiency has been linked to an astonishingly diverse array of common chronic diseases.  Let’s explore what happens in our bodies, and why I think it is CRUCIAL to check your levels with your physician and make sure your body has enough available Vitamin D3. Vitamin D is actually a group of fat-soluble secosteroids responsible for intestinal absorption of calcium and phosphate.  Basically it is a neuroregulatory steroidal …