Vitamin D can prevent falls
http://www.todaysgeriatricmedicine.com/archive/032414p18.shtml

Kids and vitamin D deficiency
http://www.aap.org/en-us/about-the-aap/aap-press-room/pages/Kids-and-Vitamin-D-Deficiency.aspx

Low Vitamin D causes fractures
http://www.aaos.org/news/aaosnow/jan13/clinical2.asp

Vitamin D lowers blood pressure
http://www.sciencedaily.com/releases/2012/04/120425094310.htm

Vitamin D helps Statin Muscle Pain
https://www.vitamindcouncil.org/blog/low-vitamin-d-levels-associated-with-statin-induced-muscle-pain/

Vitamin D and cardiovascular disease
http://www.ncbi.nlm.nih.gov/pubmed/19601865

Vitamin D decreases risk of death from Vascular causes
http://www.ncbi.nlm.nih.gov/pubmed/23257953

Study: Vitamin D reduces respiratory infections, antibiotic use 
http://www.vitamindcouncil.org/study-vitamin-d-reduces-respiratory-infections-antibiotic-use/

Low Vitamin D causes headaches
http://www.livestrong.com/article/528782-the-causes-of-headache-symptoms-with-low-vitamin-d/

Causes of headache- low Vitamin D 
http://www.livestrong.com/article/528782-the-causes-of-headache-symptoms-with-low-vitamin-d/

Vitamin D and cardiovascular risk.
[Int Urol Nephrol. 2010] - PubMed – NCBI
http://www.ncbi.nlm.nih.gov/pubmed/22457243

Vitamin D and mental health
http://www.ncbi.nlm.nih.gov/pubmed/20039126