title: Hypercobalaminemia induced by an energy drink after total gastrectomy: a case report.
abstract: We encountered a case of hypercobalaminemia induced by oral intake of an energy drink after total gastrectomy. The patient was referred to our hospital due to findings suspicious for gastric cancer on screening. A 20 mm type 0-IIc lesion was detected in the gastric subcardia on esophagogastroduodenoscopy. Total gastrectomy followed by Roux-en-Y reconstruction was performed. He was discharged without complications. His basal serum vitamin B12 level was initially maintained with monthly intramuscular injections of vitamin B12. After 9 months, his serum vitamin B12 level suddenly increased up to 36-fold higher than the normal range and persisted there for one year without vitamin B12 injections. The patient ultimately reported consuming half a bottle of an energy drink each day during this time period. This case demonstrates the risk of unexpected hypervitaminemia resulting from self-administration of nutritional supplements.
authors: Division of Gastroenterological and Hepatobiliary Surgery, and Organ Transplantation, Department of Surgery, University of Tsukuba.
authors: Kazuhiro
authors: K
authors: Takahashi
authors: Department of Surgery, Hiraka General Hospital.
authors: Shigeki
authors: S
authors: Tsukamoto
authors: Department of Surgery, Hiraka General Hospital.
authors: Yuta
authors: Y
authors: Kakizaki
authors: Department of Surgery, Hiraka General Hospital.
authors: Ken
authors: K
authors: Saito
authors: Division of Gastroenterological and Hepatobiliary Surgery, and Organ Transplantation, Department of Surgery, University of Tsukuba.
authors: Nobuhiro
authors: N
authors: Ohkohchi
authors: Department of Surgery, Hiraka General Hospital.
authors: Katsu
authors: K
authors: Hirayama
keywords: energy drink; hypercobalaminemia; supplement; total gastrectomy; transcobalamin
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