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
Barry County, Michigan. Barry County is a county in the U.S. state of Michigan. As of the 2010 census, the population was 59,173. The county seat is Hastings. The county was formed by an act of the legislature of the Michigan Territory on April 29, 1829 and organized in 1839. It was named for William Taylor Barry, United States Postmaster General under President Andrew Jackson, making it one of Michigan's cabinet counties.