What happens when you take too much vitamin C? Vitamin C is generally safe, but in large doses (anything over 2,000mg), it can cause diarrhea and nausea. High doses can also result in falsely elevated blood glucose readings, which can be problematic for diabetics.
Can too much vitamin C hurt you? The Side Effects of Too Much Vitamin C
Common side effects include nausea, vomiting, heartburn, and esophagitis. You may also notice stomach cramps, diarrhea or intestinal obstruction. However, you can also experience symptoms such as fatigue, headaches, feeling sleepy or insomnia. Flushed skin is also a symptom.
How much vitamin C can I take a day? For adults, the daily upper limit of vitamin C is 2,000 mg. For teens, it’s 1,800 mg. For children, the upper limit depends on age, and it ranges from 400 to 1,200 mg per day. In addition, vitamin C is water-soluble, making it hard for your body to store it — with excess being secreted in your urine.
What medications does vitamin C interfere with?
- Aluminum. Taking vitamin C can increase your absorption of aluminum from medications containing aluminum, such as phosphate binders.
- Protease inhibitors.
- Statins and niacin.
- Warfarin (Jantoven).