Acute oxalate nephropathy due to high vitamin C doses and exocrine pancreatic insufficiency.
Fijen, Lauré, Weijmer, Marcel · BMJ case reports · 2019 · DOI
Quick Summary
This case report describes an elderly man with ME/CFS who developed serious kidney damage after taking high doses of vitamin C supplements. He also had a pancreatic condition that affected his ability to digest fats properly. The combination of these two factors caused harmful crystal buildup in his kidneys, leading to acute kidney failure that required dialysis treatment.
Why It Matters
This case is relevant for ME/CFS patients because vitamin C supplementation is frequently used in this population to manage symptoms. The report highlights a potentially serious but preventable drug-disease interaction when high-dose supplements are combined with underlying metabolic conditions, emphasizing the need for careful medical supervision of supplement use in ME/CFS.
Observed Findings
80-year-old male with ME/CFS and exocrine pancreatic insufficiency presented with anorexia and extreme fatigue
Acute kidney injury was diagnosed on hospital admission
Kidney biopsy revealed oxalate nephropathy as the underlying cause
Patient required renal replacement therapy within 14 days of admission
High-dose vitamin C supplementation was identified as a contributing factor
Inferred Conclusions
High-dose vitamin C supplementation combined with exocrine pancreatic insufficiency can cause acute oxalate nephropathy
This combination represents a previously unreported drug-disease interaction requiring clinical awareness
Patients with pancreatic insufficiency should exercise caution with high-dose vitamin C supplementation
Medical supervision of supplement use is important in ME/CFS patients with comorbid conditions
Remaining Questions
How frequently does this complication occur in ME/CFS patients taking high-dose vitamin C with pancreatic insufficiency?
What dosage threshold of vitamin C poses risk in patients with pancreatic insufficiency?
What This Study Does Not Prove
This single case report does not establish how common this complication is among ME/CFS patients taking vitamin C, nor does it prove that all patients with pancreatic insufficiency will develop kidney damage from vitamin C supplementation. It cannot determine causation definitively or apply findings to the broader ME/CFS population without larger systematic studies.