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
Dickinson County, Michigan. Dickinson County is a county in the Upper peninsula of the U.S. state of Michigan. As of the 2010 census, the population was 26,168. The county seat is Iron Mountain. Dickinson is Michigan's newest county, formed in 1891 from parts of Marquette, Menominee, and Iron counties. It was named for Donald M. Dickinson, who served as U.S. Postmaster General under President Grover Cleveland.