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
Location of Greenville within Montcalm County, Michigan. Coordinates: 43Â°11â²N 85Â°15â²W / 43.183Â°N 85.250Â°W / 43.183; -85.250Coordinates: 43Â°11â²N 85Â°15â²W / 43.183Â°N 85.250Â°W / 43.183; -85.250. Greenville is a city in Montcalm County of the U.S. state of Michigan. The population was 8,481 at the 2010 census. Greenville residents can commute to jobs in the nearby Grand Rapids metro area.