The Top 5 Things to Know About Vitamin D - Grassroots Created July 2019 On this page The Top 5 Things to Know About Vitamin D See also VitaminDWiki Proof that Vitamin D Works Is 50 ng of vitamin D too high, just right, or not enough 3 to 55 X more likely to have 63 health problems if low Vitamin D Incidence of 22 health problems related to vitamin D have doubled in a decade Tests for Vitamin D 43 reasons for Vitamin D deficiency Does Less Sun mean More Disease 5 minute video overview 20 reasons for not taking Vitamin D debunked Tags: About D - intro