Vitamin D2 and vitamin D3 are the forms of vitamin D most important to human health, according to the Mayo Clinic. Vitamin D2 is manufactured by plants, while vitamin D3 is manufactured in the skin when it's exposed to the sun.
Population in families living in Washtenaw County ; Total Population: 238,069; Population Under 18 years: 70,878; Population 18 years and over: 167,191
Kawkawlin Township is a civil township of Bay County in the U.S. state of Michigan. The township's population was 4,848 as of the 2010 census. It is included in the Bay City Metropolitan Statistical Area.