The vitamin of the sun!
Vitamin D's functions
It creates a better immune system. Also it is good for your bones becauses it helps calcium stregnthen them. Vitamin D is also good for a healthy heart and blood circulation.
Reasons for importance
First it helps a person fight infection and sickness.
Second it improves muscle functions.
Third it improves the cardiovascular system.
Lastly it improves the respitory system.
"Vitamin D." — Health Professional Fact Sheet. N.p., 10 Nov. 2014. Web. 15 Jan. 2015
"Information on the Latest Vitamin D News and Research." Vitamin D Council. N.p., n.d. Web. 15 Jan. 2015.