@yytz: thanks for the tip. Honestly, I have a hard time believing this is serious – I mean, he’s probably about as chassidish as I am. (When I was living in Yerushalayim I was more part of that world – now I am just myself.)
Regarding vitamin B12 – I’ve had a few tests throughout my life to check whether I have some deficiency, but each test has shown that I don’t need any supplements – not for that, nor for iron or any other vitamins. I’m glad with that, since it proves that being vegetarian is perfectly normal.