A doctor is warning vegans not to believe internet rumors that vitamin B12 is unnecessary

In less than a decade, the number of people in the U.S. who identify as vegan jumped six-fold — from 1% in 2014 to 6% in 2017 according to GlobalData.  
And while the eating pattern has been linked to health benefits like lower cholesterol, clearer skin, and… [+3471 chars]