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
Penobscot County is a county located in the U.S. state of Maine. As of the 2010 census, the population was 153,923. Its county seat is Bangor. The county was established on 15 February 1816 from a portion of Hancock County when the area was still part of Massachusetts.