50 ng of Vitamin D - 100 hours of noon sunbathing OR 3 dollars of Vit D
Only 90 minutes of sun daily: if 7 factors are all good
Young, white skin, lying down, in bathing suit, hot summer sun, around noon, not overweight
3X longer for each of the following: Obese, Elderly, Dark Skin
2X longer if standing up and wearing [iki-index.php?page_id=13990] and pants
