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Vitamin C Side Effects

Although most people do not experience side effects while taking vitamin C, problems could occur if you take too much. Side effects that are typically not dangerous but that may indicate that you are taking too much vitamin C include fatigue, nausea, and insomnia. Some of the more serious side effects may include kidney stones, teeth erosion, and a blood clot in the legs.

Does Vitamin C Cause Side Effects?

Vitamin C usually does not cause significant side effects for most people, especially when taken at normal dosages. However, potentially serious vitamin C side effects can sometimes occur, especially when taken at higher dosages.
(This article covers many, but not all, of the possible side effects with vitamin C. Your healthcare provider can discuss a more complete list of side effects with you.)

Bothersome Side Effects of Vitamin C

Some people may experience annoying or bothersome side effects of vitamin C. These side effects are not typically dangerous, although they may be signs that you are taking too much vitamin C, since these side effects are more common at higher doses. These bothersome side effects may include:
  • Nausea
  • Vomiting
  • Irritation of the esophagus
  • Heartburn or indigestion
  • Intestinal cramps
  • Fatigue
  • Flushing (redness of the skin)
  • Headaches
  • Insomnia
  • Drowsiness
  • Diarrhea.
Some people may experience irritation or allergic reactions when vitamin C is applied to the skin.
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