What is the recommended treatment and dosing for vitamin C deficiency (scurvy)?

Treatment of Vitamin C Deficiency (Scurvy)

For confirmed or suspected scurvy, initiate high-dose vitamin C supplementation immediately: 1000 mg daily for 1-2 weeks, followed by maintenance dosing of 100-200 mg daily until clinical resolution. 1, 2

Acute Treatment Protocol

Initial High-Dose Therapy

• Administer 500-1000 mg of vitamin C daily for the first 1-2 weeks to rapidly replete body stores and reverse clinical manifestations 3, 1, 2
• Oral administration is typically sufficient and preferred for most patients 1, 2
• Intravenous vitamin C may be necessary in patients with severe malabsorption, continued bleeding symptoms despite oral supplementation, or critical illness 4, 5
  • One case demonstrated that high-dose oral supplementation (2000 mg daily) failed to maintain adequate levels in a patient with Crohn's disease, requiring home IV therapy 5
  • Another case used IV supplementation in a critically ill patient with pulmonary hypertension and altered mental status, resulting in marked improvement 4

Route Selection Algorithm

• Start with oral vitamin C 1000 mg daily for patients who can tolerate oral intake and have no severe malabsorption 1, 2
• Switch to IV administration (500 mg daily) if: 4, 5, 3
  • Patient has documented malabsorptive syndrome (inflammatory bowel disease, short gut)
  • Symptoms persist or recur despite adequate oral dosing
  • Critical illness with altered mental status or severe cardiopulmonary compromise
  • Inability to take oral medications

Maintenance and Prevention

Transition to Maintenance Dosing

• After 1-2 weeks of high-dose therapy, reduce to 100-200 mg daily until complete clinical resolution 1, 2
• Clinical improvement typically occurs within days to weeks, with skin lesions resolving and mobility returning 3
• Continue maintenance dosing longer in patients with ongoing risk factors (restrictive diets, malabsorption, alcoholism) 6

Long-Term Prevention

• Recommended daily allowance varies by guideline body: 40-45 mg/day (WHO/FAO), 75 mg/day for women and 90 mg/day for men (US RDA), or 95-110 mg/day (European authorities) 7
• The discrepancy reflects different health perspectives: preventing scurvy versus optimizing overall health 7
• For at-risk populations, aim for the higher end of recommendations (90-110 mg daily) to prevent subclinical deficiency 7

Clinical Recognition and Diagnosis

High-Risk Populations Requiring Screening

• Maintain high index of suspicion in: 4, 3, 6
  • Patients with alcohol use disorder
  • Restrictive eating patterns (autism spectrum disorder, psychiatric illness)
  • Malabsorptive conditions (Crohn's disease, short gut syndrome)
  • Social isolation, homelessness, or food insecurity
  • Elderly with poor nutritional intake

Pathognomonic Clinical Features

• Perifollicular hemorrhages and petechiae - highly specific for scurvy 3, 2, 6
• "Corkscrew" hairs on chest, abdomen, and legs - classic finding 3, 2
• Spontaneous ecchymoses without trauma 3, 2
• Gingival bleeding and poor dentition 3, 1
• Bone pain, joint contractures, and limping (especially in children) 8

Laboratory Confirmation

• Serum ascorbic acid level <2 mg/L (or <11 μmol/L) confirms deficiency 1
• Laboratory testing is not mandatory if clinical presentation is classic - empiric treatment should not be delayed 3
• Associated findings: normocytic anemia, hypocholesterolemia, hypoalbuminemia 3, 1

Common Pitfalls to Avoid

Diagnostic Delays

• Scurvy mimics autoimmune disorders, hematologic malignancies, and coagulopathies, leading to extensive unnecessary workup 6
• A simple dietary history question can prevent invasive procedures and prolonged suffering 8
• Do not wait for laboratory confirmation if clinical suspicion is high - start treatment immediately 3

Treatment Failures

• Oral supplementation may fail in malabsorptive states - monitor for persistent symptoms and switch to IV route if needed 5
• Patients with restrictive eating require ongoing nutritional intervention beyond vitamin C repletion 8
• Address underlying social determinants (poverty, isolation, food access) to prevent recurrence 6

Expected Clinical Response

• Rapid improvement within days to 2 weeks: resolution of fatigue, improved mobility, healing of skin lesions 3, 2
• Anemia typically improves within weeks 4, 3
• Joint contractures and bone pain resolve with continued therapy 3
• Failure to improve suggests alternative diagnosis or inadequate absorption requiring IV therapy 5