Altitude: People living at higher altitudes can produce more vitamin D because the UVB rays travel a shorter distance to the skin.Geographic location: People living in countries further from the equator usually get less vitamin D because more of the UVB rays are absorbed by the ozone layer.Skin color: Individuals with darker skin tones have more melanin, a natural pigment in the body that protects the skin from UV damage, so they tend to produce less vitamin D through sun exposure.Time of day: The best time for sun exposure is noon since the sun is most intense, meaning you don't have to stay out as long to get an adequate amount of vitamin D.Several factors affect UVB exposure and vitamin D production, including: It would be possible to get adequate vitamin D with limited exposure to your arms and legs for 10 to 15 minutes two to three times a week," says Susan Massick, MD, a dermatologist at The Ohio State University Wexner Medical Center and associate professor of dermatology in the Ohio State College of Medicine. "It does not take excessive amounts of sun to get a healthy dose of vitamin D.
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