Acute Intoxication with Vitamins D, C, and Zinc in Children

Introduction to Toxicity Risks

The American Academy of Pediatrics recommends that children who ingest 20 times the daily recommended dose of vitamin D, vitamin C, and zinc require urgent medical evaluation, as excessive vitamin D can cause severe and potentially life-threatening hypercalcemia, while vitamin C and zinc pose lower risks at this dose 1, 2

The daily recommended dose for children is 400-600 IU/day, with a tolerable upper limit varying by age: 1000 IU/day for infants 0-6 months, 1500 IU/day for 7-12 months, 2500 IU/day for 1-3 years, 3000 IU/day for 4-8 years, and 4000 IU/day for 9-18 years, as recommended by the National Institutes of Health 1
A dose 20 times the recommended amount (8000-12,000 IU/day) significantly exceeds these limits and can cause toxicity if administered for weeks or months, according to the Clinical Nutrition journal 1
The Endocrine Society recommends that hypercalcemia be treated with aggressive intravenous hydration with saline solutions, furosemide to increase renal excretion of calcium, corticosteroids to reduce intestinal absorption of calcium, and calcitonin for rapid reduction of serum calcium, as outlined in the Clinical Nutrition journal 3

The daily recommended dose varies from 40-50 mg/day for infants to 45-75 mg/day for children and adolescents, as recommended by the American Journal of Kidney Diseases 4
A dose 20 times the recommended amount (800-1500 mg/day) is generally well-tolerated, as vitamin C is water-soluble and excess is renally eliminated, according to the Clinical Nutrition journal 3

The daily recommended dose varies from 2-3 mg/day for infants to 8-11 mg/day for older children, as recommended by the American Journal of Kidney Diseases 4
A dose 20 times the recommended amount (40-220 mg/day) can cause nausea, vomiting, abdominal pain, diarrhea, and interference with copper absorption, as outlined in the Clinical Nutrition journal 5

The American Academy of Pediatrics recommends immediate evaluation, including determination of total and ionized serum calcium, measurement of 25(OH) vitamin D to confirm intoxication, evaluation of renal function, and analysis of urine for calciuria and calcium/creatinine ratio, as recommended by the Clinical Nutrition journal 1
The National Institutes of Health recommends frequent clinical and laboratory monitoring until parameters normalize, as outlined in the Clinical Nutrition journal 1