A recent Italian study of myotonic dystrophy patients concluded that many patients up to 88% may show deficiencies of Vitamin D. Over 40% of patients showed severe Vitamin D deficiencies. Patients with DM may need to consider a multivitamin of Vitamin D supplement to insure adequate nutrition. Many DM patients have less social and ambulatory abilities which may limit their outdoor activities in sunny weather. The sun which is a source of vitamin D.