Let’s talk about the “Vitamin D3 supplement fad”, a fad that will cause much more damage before it is through. Here are three separate mechanisms from the scientific literature that can cause low 25(OH)D (aka “your Vitamin D level” that’s tested by your doctor), and when corrected, corrects the “low Vitamin D level”: 1. Low calcium levels (in the tissues) cause “low Vitamin D”: http://www.westonaprice.org/…/an-ancestral-perspective-on-…/ Chronic disease and/or living in low-sun-intensity areas often shows with low calcium on a