acute kidney injury, chronic kidney disease, gastrointestinal bleeding, hypercalcemia, vitamin D supplementation, Medicine, Medicine (General), R5-920

ABSTRACT Excessive vitamin D supplementation may result in significant clinical complications. This case of a 77‐year‐old male demonstrates how unsupervised high doses led to severe hypercalcemia, acute kidney injury, and gastrointestinal bleeding. It underscores the importance of precise dosing, regular monitoring, and medical supervision of vitamin D supplementation.