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Moscow expert warns against high-dose vitamin C
Therapist and pathologist Svetlana Burnatskaya said in Moscow on October 28, 2026, that high doses of vitamin C could cause gastrointestinal problems. The expert said excessive consumption could increase the risk of kidney stones in people with certain predispositions, adding that those with a balanced diet can meet their needs through natural sources.
Therapist and pathologist Svetlana Burnatskaya said in Moscow on October 28, 2026, that taking high doses of vitamin C could cause certain health problems.
Effects of high doses
Burnatskaya said vitamin C's solubility in water does not mean it can be consumed in unlimited amounts, adding that excessive doses could cause nausea, abdominal pain, diarrhea, stomach cramps and intestinal problems.
The expert also noted that consuming too much vitamin C could increase the risk of kidney stone formation in people with certain predispositions.
Mega-doses provide no additional protection
Burnatskaya said antioxidants contribute to protecting cells from damage, but the body does not need mega-doses. She said the belief that high-dose use is risk-free because excess vitamin C is excreted in urine is incorrect.
The doctor said vitamin C products from pharmacies receive more attention during periods of common colds. Burnatskaya stressed that the approach of “the more, the more beneficial” is a dangerous oversimplification.
Natural sources of vitamin C
Burnatskaya said people who eat a normal and balanced diet can meet their vitamin C needs through fruit, vegetables and berries, adding that recommended doses should not be exceeded without justification.
Burnatskaya also said antioxidants do not provide a universal shield against all diseases.
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