High vitamin B intake linked to increased cancer risk in men
A US-based study on 77,000 patients suggests long-term, high dosage of vitamin B6 and B12 supplements is associated with two to four-fold increased lung cancer risk in men. The risk was further elevated in male smokers taking over 20 milligrams of B6 or 55 micrograms of B12 a day for 10 years, while no such risks were observed among women.