4 vitamins and minerals that can cause cancer

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Vitamins and minerals promise many health benefits, but only a few of them have scientifically proven properties. In fact, even their safety has been questioned, as a number of studies have revealed a potential cancer risk. Four supplements in particular can increase the likelihood of disease if not taken in the correct dosage.

An early study by Tim Bayer, director of cancer prevention and control at the University of Colorado Cancer Center, found that a number of supplements may increase the chance of cancer.

The researcher, who conducted a meta-analysis of 12 trials involving more than 300 000 people, investigated the relationship between cancer and several vitamins to assess their protective effects.

The analysis showed that high doses of beta-carotene, selenium, vitamin E and folic acid were associated with an increased risk of developing cancer.

The lead researcher said it remains unclear why the supplements have these side effects, unlike other supplements included in the analysis.

Selenium Supplements

Studies show that selenium supplements taken in high doses can cause serious side effects. Although the link of the supplement to cancer remains unclear, some studies suggest that it may increase the risk of aggressive and secondary tumors. A study conducted by the University of Colorado Cancer Center found that the supplement was associated with a higher risk of skin cancer.

Vitamin E

Some studies have shown that there may be a link between vitamin E and an increased risk of prostate cancer.

Folic Acid

There is mixed evidence supporting an association between folic acid intake acid and an increased risk of colon cancer.

Beta-carotene

Beta-carotene supplements have been linked to an increased risk of lung cancer in people who smoke or were exposed to asbestos.