Sunshine Not Enough?
Dr. Neil Binkley investigated the vitamin D status of people 93 people living in Hawaii.
Despite abundant sun exposure (a mean of approximately 11 hours per week of total body skin exposure with no sunscreen used), 51% of these individuals were found to have low vitamin D levels.
“This implies that the common clinical recommendation to allow sun exposure to the hands and face for 15 minutes may not ensure vitamin D sufficiency.”
“Adequate sun exposure no guard against low vitamin D,” by Will Boggs, MD