Dear Doctor: I’m 19 years old, and I switched to a vegan diet six months ago. I’m careful about getting enough vitamin B12. However, some of my girlfriends say it’s not that important and your body makes all the B12 you need. Is that true?
Dear Reader: This is a serious issue, and the answer is that nothing your friends are telling you about vitamin B12 is correct. In fact, their advice puts you an…