Vitamin D In years past there was concern that people were getting too much vitamin D rather than not enough, but new research shows very high rates of deficiency, prompting remarkable changes in thinking on how much is needed for good health. The laboratory reference range was dramatically raised from 7-46 ng/mL to 32-100 ng/mL and many experts now believe a level of 40 is the minimum acceptable level for good health.
Deficiencies are linked to a multitude of health problems, including osteoporosis, bone and muscle pain, and lack of emotional wellbeing and certain cancers may also be related to deficiency. The Mayo Clinic performed research on 150 patients with chronic nonspecific musculoskeletal pain and found virtually all to be deficient in vitamin D (93% using the old reference ranges) (Mayo Clinic Proc. 2003 Dec;78(12):1463-70).
Deficiency is easily identified with a blood test, and correctable with quality supplements.