Oliguric Acute Kidney Injury Triggered by Supplemental Vitamin B12- Methylfolate: A Case Report

This case report presents a 53-year-old female who developed oliguric acute kidney injury (AKI) following the use of a vitamin
B12-methylfolate liquid syrup supplement purchased through social media. The patient presented with severe gastrointestinal
symptoms, leading to hypovolemia and AKI. Renal biopsy revealed acute tubular necrosis (ATN) and mild acute interstitial
nephritis (AIN). The regional poison center was notified to investigate the potential contamination, but due to financial
constraints, no evaluation was conducted. This case highlights the risks of unregulated supplements and the need for a thorough
evaluation in cases of unexplained acute kidney injury.