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
Monroe County, Michigan. As of the census[33] of 2000, there were 145,945 people, 53,772 households, and 39,952 families residing in the county. The population density was 265 people per square mile (102/kmÂ²). There were 56,471 housing units at an average density of 102 per square mile (40/kmÂ²).