Background: The amount of ultraviolet B (UV-B) radiation absorbed by the skin determines serum 25-hydroxyvitamin D (25-[OH]D) concentrations. Conventional teaching holds that UV-B radiation from sunlight or tanning beds cannot induce vitamin D toxicity (1).

Objective: To support recent information that contradicts this conventional teaching (2).

Case Report: A 48-year-old postmenopausal woman developed a spontaneous pubic and bilateral sacrum fracture in December 2012. Nine months earlier, she had undergone surgical fusion of the second lumbar vertebra to the sacrum for degenerative scoliosis with secondary neurogenic claudication. Blood tests found increased levels of total alkaline phosphatase and 25-(OH)D with normal levels ...