Vitamin D Supplementation Guidelines

Introduction to Vitamin D Supplementation

• The American Academy of Pediatrics recommends all infants, children, and adolescents to receive daily vitamin D supplementation with age-specific dosing: 400 IU/day for infants 0-12 months and 600 IU/day for children and adolescents 1-18 years 1

Standard Maintenance Dosing

• Infants 0-12 months should receive 400 IU/day from all sources (diet plus supplements), regardless of feeding method 1
• Children and adolescents 1-18 years should receive 600 IU/day from all sources 1
• Preterm infants on parenteral nutrition should receive 200-1,000 IU/day (or 80-400 IU/kg/day) 1

Treatment of Vitamin D Deficiency

• For mild deficiency (5-15 ng/mL), treatment options include 4,000 IU/day orally for 12 weeks or 50,000 IU every other week for 12 weeks 1
• For vitamin D insufficiency (16-30 ng/mL), treatment options include 2,000 IU daily for 12 weeks or 50,000 IU every 4 weeks 1
• For severe deficiency (<5 ng/mL), use the mild deficiency regimen and assess for clinical rickets and metabolic bone disease 1

Formulation Selection

• Cholecalciferol (vitamin D3) is preferred over ergocalciferol (vitamin D2) due to higher bioefficacy 2, 1

Safety Thresholds and Upper Limits

• The Institute of Medicine established age-specific upper tolerable limits to prevent toxicity: 1,000 IU/day for 0-6 months, 1,500 IU/day for 7-12 months, 2,500 IU/day for 1-3 years, 3,000 IU/day for 4-8 years, and 4,000 IU/day for 9-18 years 1

Special Populations

• Children with chronic kidney disease (CKD) stages 3-5 may require higher or more frequent supplementation, with close monitoring of calcium and phosphorus levels 2, 1
• Children on parenteral nutrition should have 25(OH)D levels monitored periodically and receive additional supplementation if levels fall below 50 nmol/L (20 ng/mL) 1

Target Serum Levels

• The treatment goal is to achieve and maintain 25(OH)D levels above 20 ng/mL (50 nmol/L) for bone health 1