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
17% of the population in Marquette County, MI (62,940 people) live below the poverty line, which is higher than the national average of 14.7%. The largest group living in porverty is Female 18-24, followed by Male 18-24 and then Female 25-34.