PTH and nutritional disorder: A 2006 study evaluated patients with osteoporosis, low blood levels of vitamin D, and high levels of PTH to verify the correlation with magnesium deficiency: 30 women over 60 years of age with osteoporosis and vertebral fractures, following physical and biochemical assessments, were recruited into the study and monitored for a period of 12 months, of which 29 completed the study.