Onion and Leek Consumption, Garlic Supplement Use and the Incidence of Cancer

This review discusses the potential health benefits of Allium vegetables, especially their association with reduced cancer risk, but reports no new clinical outcomes.

This article reviews the potential health benefits of onions, highlighting their anti-inflammatory, anticancer, and antioxidant properties, but does not report any new clinical results.

This review concludes that although observational studies suggest a potential inverse association between selenium exposure and cancer risk, randomized trials show no convincing evidence that selenium supplements prevent cancer in humans and may indicate harmful effects.

This study reported that selenium supplements do not reduce cancer risk and may increase the risk of type 2 diabetes and high-grade prostate cancer, while observational studies suggest mixed associations between selenium exposure and cancer incidence.

This review examines the use of selenium and vitamin E supplements for reducing prostate cancer risk, finding mixed evidence that suggests benefits may be limited to individuals with specific risk factors, like low baseline levels or smoking history, rather than broadly applicable.