Vitamin C side effects are mild and occur when taking over 2,000 mg daily. Common side effects include nausea, vomiting, and diarrhea. Serious side effects are rare but can occur in people with certain health conditions. Topical use can cause skin irritation in those with allergies. People with serious health problems should consult a doctor before taking vitamin C supplements. It can increase the risk of kidney stones and raise blood sugar in diabetics. Pregnant women should not take more than 120 mg per day.
Most vitamin C side effects are very mild and usually occur only when a person has taken more than 2,000 mg, which is the maximum daily dose. Some common side effects of vitamin C are nausea, vomiting, and diarrhea. Other side effects of vitamin C that are occasionally reported are headaches, fatigue, and heartburn. Serious side effects from vitamin C are very rare and usually occur only in people who have certain health conditions. People with cancer, kidney stones, and diabetes should take vitamin C supplements under the supervision of a doctor to avoid these serious side effects.
Most vitamin C side effects occur when a person takes vitamin C supplements, but the vitamin can also cause a reaction in people who use the supplement topically. There are different skin creams and medications that contain vitamin C, and the use of these can cause irritation at the application site in people with skin allergies. A person experiencing mild side effects from using vitamin C topically or internally should probably discontinue use of the supplement to see if the problems clear up. If they don’t, the symptoms may be related to some other health problem that may require medical attention.
People with serious health problems should never take any supplement without first consulting their doctor. This is especially true with vitamin C supplements, because the side effects of vitamin C can make some existing health problems worse. For example, people with cancer may need to closely monitor their vitamin C intake because cancer cells seem to absorb an unusually high amount of vitamin C. Scientists aren’t entirely sure why this occurs, and until more is known, People with cancer are not recommended to take the supplements without medical supervision.
Vitamin C can also increase the chances of kidney stones in people who have a history of them. It is also not recommended that a person with existing kidney stones take vitamin C supplements because they could make the problem worse. Vitamin C also tends to raise blood sugar in diabetics, and a doctor should monitor the amount of vitamin C a diabetic person takes in each day, in addition to what the person naturally absorbs from food. Pregnant women can also be careful not to take more than 120 mg of vitamin C per day. More than this could cause problems for the unborn baby.
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