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
Ingham County is a county located in the U.S. state of Michigan. As of the 2010 census, the population was 280,895. The county seat is Mason. Lansing, the state capital of Michigan, is located within the county, and is the only state capital located in a county that is not also its seat of government. The county is home to Michigan State University, Lansing Community College, and the Class A minor league baseball team Lansing Lugnuts.