The dietary supplement 5-hydroxytryptophan and urinary 5-hydroxyindole acetic acid

During an appointment to sign consent for endoscopy of the upper and lower gastrointestinal tract, the patient reported that, for the last 18 months, she had been taking 5- hydroxytryptophan (5-HTP, 100 mg daily, Natural Factors, Coquitlam, BC), which she had purchased from a local health food store...

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