BBC, 2017: "Vitamin B6 and B12 Supplements Appear to Cause Cancer in Men. A newly discovered risk associated with common energy and metabolism pills. Alarming new evidence of a three-fold increase in cases among people who take high-dose B6 and B12...around 50 percent of people in the United States take some form of “dietary supplement” product, and among the most common are B vitamins. Worse than just a harmless waste of money, this usage could be actively dangerous. In an issue of the Journal of Clinical Oncology, published this week, researchers reported that taking vitamin B6 and B12 supplements in high doses (like those sold in many stores) appears to triple or almost quadruple some people’s risk of lung cancer.

BBC, 2017: "Vitamin B6 and B12 Supplements Appear to Cause Cancer in Men. A newly discovered risk associated with common energy and metabolism pills. Alarming new evidence of a three-fold increase in cases among people who take high-dose B6 and B12...around 50 percent of people in the United States take some form of “dietary supplement” product, and among the most common are B vitamins. Worse than just a harmless waste of money, this usage could be actively dangerous. In an issue of the Journal of Clinical Oncology, published this week, researchers reported that taking vitamin B6 and B12 supplements in high doses (like those sold in many stores) appears to triple or almost quadruple some people’s risk of lung cancer.