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
Swain County Population and Races. As of 2010-2014, the total population of Swain County is 14,070, which is 8.50% more than it was in 2000. The population growth rate is much lower than the state average rate of 21.13% and is lower than the national average rate of 11.61%.