Can summer sun give you enough vitamin D? Chances are, no. “Most people don’t get enough unprotected sun exposure to make enough vitamin D,” says Ken Redcross, MD, a holistic physician and author of Bond: The 4 Cornerstones of a Lasting and Caring Relationship with Your Doctor.
Based on research and his years of experience in routinely testing patients’ vitamin D levels, Redcross estimates that 80–90 percent of Americans are low in the sunshine vitamin, even in warm Southern states. Fatigue, anxiety, recurrent infections, and feeling “not yourself” are common signs.