Tiny Vitamin B12: A Reporter's Journey of Health DiscoveryLi Xiaohua, a veteran health reporter, never thought she would be so interested in a seemingly ordinary bottle of vitamin B12. Until her friend, Zhang Shouxin, the chief physician of the neurology department at the city center hospital, told her shocking news: "Xiaohua, do you know? This vitamin B12, which costs just a few yuan per bottle, may have unexpected improvement effects on many common diseases...