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
With 25,420 people, Iosco County is the 55th most populated county in the state of Michigan out of 83 counties. But watch out, Iosco County, because Gladwin County with 25,411 people and Manistee County with 24,420 people are right behind you.