Vitamin C Side Effects

Common side effects of high dose vitamin C are listed below. Call your doctor for medical advice about side effects if they are severe or persist after a few days.

• Nausea
• Heartburn
• Diarrhea
• Vomiting
• Stomach cramps
• Bloating
• Headache
• Excessive sleepiness or insomnia
• Fatigue
• Skin flushing

The above list may not include all the potential side effects of vitamin C. Contact your healthcare provider if your side effects are unusual or severe or do not get better over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Vitamin C Overdose: In case of an overdose of vitamin C, call your doctor immediately. You can also call your local poison control center, provincial poison control center, or the national poison control center at 1-800-222-1222. Call 911 or emergency services if a person has collapsed, cannot breathe, has had a seizure, or cannot be awakened.

Source: FDA