Excessive Vitamin C Intake May Pose Health Risks, Medical Expert Warns
Despite the widespread belief that high doses of vitamin C strengthen the immune system and protect against colds and influenza, excessive consumption offers no additional benefits and may pose health risks.
Dr. Svetlana Bornatskaya, an occupational medicine specialist, said vitamin C supplements are widely available in pharmacies, particularly during the cold and flu season. However, the common practice of taking effervescent tablets, powders or multiple pills to "boost immunity" is based on a misconception.
She explained that although antioxidants help protect cells from damage, the body does not require excessive amounts of them.
"Balance is essential, rather than the assumption that more is always better," she said.
Bornatskaya also challenged the misconception that excess vitamin C is harmless because the body eliminates it through urine. Although vitamin C is water-soluble, excessive intake can still cause nausea, abdominal pain and diarrhea. It may also increase the risk of kidney stone formation in people who are predisposed to the condition.
According to the specialist, a balanced diet containing fruits, vegetables and berries is generally sufficient to meet the body's vitamin C requirements. Supplements should primarily be used when a deficiency has been confirmed or when specific medical conditions warrant their use.
She added that the most common signs of excessive vitamin C consumption affect the digestive system and include nausea, abdominal cramps and diarrhea.
"Antioxidants do not provide comprehensive protection against all diseases," Bornatskaya said, emphasizing that vitamin supplements should complement, rather than replace, a healthy diet, adequate sleep and appropriate medical treatment.
She advised against exceeding recommended vitamin C doses without a medical reason, stressing that supplements should be taken when there is a genuine need.
