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A 32-year-old man comes to the office due to a substernal burning sensation that has been occurring intermittently over the last 6 months. The sensation worsens with spicy and fatty meals and is associated with food regurgitation and a sour taste in the back of the throat. He has no projectile vomiting, dysphagia, or unexpected weight loss. Medical history is significant for cystic fibrosis complicated by pancreatic insufficiency, for which the patient takes pancreatic enzyme replacement therapy with all meals. Vital signs are within normal limits. The abdomen is soft and nontender. He is prescribed omeprazole with subsequent improvement in his gastroesophageal reflux symptoms. In this patient, absorption of which of the following nutrients will likely improve due to initiation of this new medication?