Vitamin C (ascorbic acid)Downloads

A 45-year-old man undergoes an esophagogastroduodenoscopy for his recurrent episodes of epigastric pain. He also lost a significant amount of weight in the last 6 months. He says that he has been taking a number of dietary supplements "to cope". His past medical history is insignificant, and a physical examination is within normal limits. The endoscopy shows a bleeding ulcer in the proximal duodenum. Lab tests reveal a serum iron level of 130 μg/dL. However, his stool guaiac test is negative for occult blood. Over-ingestion of which of the following substances is the most likely cause for this patient’s lab findings?

A 35-year-old woman presents to the clinic with a 2-week history of headaches. She was in her usual state of health until 2 weeks ago, when she started having headaches. The headaches are throughout her whole head and rated as a 7/10. They are worse in the mornings and when she bends over. She has some mild nausea, but no vomiting. The headaches are not throbbing and are not associated with photophobia or phonophobia. On further questioning, she has noticed more hair than usual on her pillow in the morning and coming out in her hands when she washes her hair. The past medical history is unremarkable; she takes no prescription medications, but for the past year she has been taking an oral 'health supplement' recommended by her sister, which she orders over the internet. She cannot recall the supplement's name and does not know its contents. The physical exam is notable for some mild hepatomegaly but is otherwise unremarkable. This patient's presentation is most likely related to which of the following micronutrients?