Vitamins are essential for the body and often regarded as beneficial to health. Indeed, some studies suggest that certain vitamins can help prevent cancer and other serious diseases. However, it is crucial to obtain vitamins from external sources—such as food—because the body cannot produce them adequately on its own.
But the mantra “more is better” should not apply when it comes to vitamins. Overdosing on vitamin supplements can have severe consequences, including an increased risk of lung cancer. This article delves into the issue and highlights the warning from experts.
Vitamins: Oversupply Increases Cancer Risk
A vitamin-rich diet is generally considered a healthy way to reduce one’s cancer risk. According to the German Cancer Research Center, daily intake of vitamin D could lower cancer mortality in the population by up to twelve percent.
However, not all vitamins function as vitamin D does. For many years, the German Cancer Society promoted the belief that the antioxidant properties of certain vitamins could prevent cancer. Yet, experts now caution that there is insufficient evidence on the mechanisms and effects of antioxidants on the body.
The German Cancer Society claims that additional vitamin supplements are only advisable under specific conditions, such as during pregnancy or when the absorption of substances like vitamin D or calcium is impaired in the gastrointestinal tract. However, these cases are rare in Germany, and excessive intake can be harmful, even increasing the risk of cancer according to the German Cancer Society.
Lung Cancer: This Vitamin Increases Risk
A study published in 2019 indicated a heightened risk of lung cancer associated with high doses of vitamin B12. As reported by the German Cancer Society on their website, it is essential to understand that vitamin B12 does not cause cancer per se; rather, high doses may enhance the growth of already existing cancer cells. Hence, the German Cancer Society recommends checking serum vitamin B12 levels before considering supplementation and consulting a physician.
Vitamins That May Favor Lung Cancer Development
Another study from the Journal of Clinical Investigation in 2023 suggested that the risk of developing malignant lung tumors could be exacerbated by the intake of certain vitamins. These include vitamin A, water-soluble vitamin C, and vitamin E—the so-called antioxidants. These vitamins are essential for healthy skin, teeth, gums, bones, and blood vessels. However, they might also activate mechanisms that benefit cancer cells.
How Vitamins Can Aid Tumors
According to researchers, cancer tumors may form new blood vessels due to these vitamins. This improved nutrient supply allows the tumors to grow faster. While antioxidants found in regular food, such as fruits and vegetables, are not considered problematic, it’s important to avoid supplements like pills, drops, or vitamin-rich drinks. Many manufacturers use misleading claims in their marketing.
