Question: can emergen c cause nausea?
Answer: Emergen-C is generally considered safe, but there may be side effects if you're taking it in high doses. Ingesting more than 2 grams of vitamin C can trigger unpleasant side effects including nausea, abdominal cramps and diarrhea — and may increase your risk of developing kidney stones ( 22 , 23 , 24 , 25 ).