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In the third Daily Lipid Video Blog, Chris Masterjohn, PhD, explains why low 25(OH)D can be caused by numerous factors besides vitamin D deficiency, including a deficient intake of calcium. The blog post this video summarizes can be found here:

http://www.westonaprice.org/blogs/cmasterjohn/2013/12/19/an-ancestral-perspective-on-vitamin-d-status-part-2-why-low-25ohd-could-indicate-a-deficiency-of-calcium-instead-of-vitamin-d/