Vitamin C: Vitamin C is usually well tolerated. However, nausea, vomiting, heartburn, abdominal cramps, fatigue, flushing, insomnia, and sleepiness have been reported with high doses (ex. 1 g or more daily).
Zinc: Gastrointestinal side effects such as nausea and vomiting are seen with doses of elemental zinc greater than 30 mg.
Patient should seek medical attention immediately at the first sign of any adverse drug reaction.
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