New Study Suggests Vitamin C May Help Prevent Certain Types of Cancer

A simple vitamin in your diet may help protect your stomach from potentially cancer-linked chemical reactions.

New research from the University of Waterloo suggests that Vitamin C may reduce the formation of harmful compounds in the stomach that have been linked to cancer risk. The findings, published in the Journal of Theoretical Biology and based on a mathematical model, may also explain why previous studies on nitrates, nitrites, and cancer have produced conflicting results.

Nitrates and nitrites are naturally found in foods such as leafy vegetables, but they are also present in processed meats like bacon and salami. Inside the stomach, these compounds can undergo a chemical reaction called nitrosation, producing substances that scientists believe may increase cancer risk.

Researchers developed a mathematical model to simulate how nitrates and nitrites move through the body, including the salivary glands, stomach, small intestine, and bloodstream. The model showed that Vitamin C can interfere with nitrosation, reducing the formation of these potentially harmful compounds.

The findings also help explain why vegetables rich in nitrates, such as spinach, are generally considered healthy. These foods naturally contain both nitrate and Vitamin C, and the vitamin appears to counteract the harmful chemical reactions that nitrates might otherwise trigger.

The simulations further suggested that taking a Vitamin C supplement after meals may moderately reduce the formation of cancer-linked nitrosation products from dietary nitrates and nitrites, including those found in processed meats.

Researchers stress that these results come from a mathematical model, not human clinical trials, so they do not prove that Vitamin C prevents cancer. However, the model offers valuable insights into how diet may influence these chemical reactions.

The team hopes their work will guide future laboratory and clinical studies by helping scientists investigate how factors such as Vitamin C intake, meal timing, stomach conditions, and the oral microbiome affect nitrosation and cancer risk.

REFERENCE: Gordon R. McNicol, Nandita B. Basu and Anita T. Layton; “Vitamin C as a nitrosation inhibitor: A modelling study across dietary patterns and water quality”; 2026, Journal of Theoretical Biology; DOI: 10.1016/j.jtbi.2026.112444