Vitamin C Supplementation in Children

Recommended Intake and Safety

• The American Academy of Pediatrics recommends a daily intake of 25 mg/day for children aged 4-8 years 3
• For therapeutic purposes, doses of 15-25 mg/kg/day for infants or 80 mg/day for older children are considered safe by the American Academy of Pediatrics 1, 4
• The National Institutes of Health recommends never exceeding 10 times the dietary reference intake (approximately 250 mg/day for a 5-year-old) without proven severe deficiency 1

Toxicity Risks and Adverse Effects

• High doses (>2 g/day) commonly cause osmotic diarrhea, nausea, and abdominal discomfort, according to the American Journal of Kidney Diseases 5, 4
• Children under 2 years are at higher risk of oxalate nephropathy due to age-related decreased glomerular filtration, as reported by the American Academy of Pediatrics 2

Absolute Contraindications in Children

• The American Academy of Pediatrics recommends screening for hemochromatosis or iron overload conditions, G6PD deficiency, history of oxalate kidney stones, and severe renal dysfunction before any high-dose vitamin C supplementation 1, 2
• Children with pre-existing kidney disease (CKD stages 1-4) should not exceed 100 mg/day, according to the National Kidney Foundation 1, 2

Clinical Management of Suspected Overdose

• Gastrointestinal symptoms (diarrhea, nausea) are the most likely presentation, and supportive care with hydration is typically sufficient, as recommended by the American Journal of Kidney Diseases 5, 4
• Monitor for signs of dehydration from osmotic diarrhea, and ensure adequate hydration to promote oxalate excretion, as advised by the American Academy of Pediatrics 5

Important Clinical Pitfalls

• Many multivitamin preparations contain vitamin C, so total intake from all sources must be calculated, as recommended by the American Journal of Kidney Diseases 3, 5
• In children with restrictive diets or malnutrition, distinguish between appropriate therapeutic dosing (80 mg/day) and excessive supplementation, as advised by the American Academy of Pediatrics 4

When Supplementation Is Actually Needed

• Vitamin C supplementation is clinically indicated only in specific circumstances, such as documented scurvy or severe deficiency, severe malnutrition, or chronic restrictive diets, as recommended by the American Academy of Pediatrics 2, 4
• Children on hemodialysis may require increased supplementation due to increased losses, as reported by the National Institutes of Health 3