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
Wayne County is the most populous county in the U.S. state of Michigan. As of the 2010 census, its population was 1,820,584, making it the 19th-most populous county in the United States.ayne County was the sixth county in the Northwest Territory, formed 15 August 1796 from portions of territorial Hamilton County, territorial Knox County and unorganized territory.