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
As of the 2010 United States Census the township had a total population of 92,843, representing an increase of 32,491 (+53.8%) from the 60,352 counted in the 2000 Census, which had in turn increased by 15,304 (+34.0%) from the 45,048 counted in the 1990 Census.