DMD and hyperinsulinemic hypoglycemia, familial, 4: Prophylaxis in boys with DMD (> 1 year): 1,000 IU/day;Treatment (deficiency if 25-OH-vitamin D levels < 12 ng/ml):1-12 years: 3,000–6,000 IU/day (12 weeks);> 12 years: 6,000 IU/day (12 weeks).After treatment, keep regular use of prophylactic doses.