Q. A 52-year-old male with a history of regular blood transfusions due to Beta-thalassemia presents to the emergency department with severe fatigue and abdominal pain. He reports frequent episodes of nausea, vomiting, and diarrhea over the last few months. Physical examination reveals hepatomegaly. On further questioning, the patient mentions that he started taking daily high-dose vitamin C supplements six months ago to improve his immune function and energy levels. Recent laboratory studies show elevated serum iron levels and a CT scan demonstrates the presence of multiple renal stones. Based on the patient's clinical presentation and history, what is the most likely cause of the patient's current symptoms?