Vitamin D Deficiency . Amanda Sauer Dylan Spicer December 2010. The purpose of Vitamin D. It helps maintain normal blood levels of calcium and phosphorus. It is required for proper growth of the bones and teeth. It promotes bone mineralization with several other vitamins.
Only if you live south of here do you get enough sunlight year around to get the adequate enough of vitamin D. Otherwise you need other sources.
Easiest way to consume Vitamin D
Less than $10
Found at any local herb shop or most super markets.