Never tried Marmite in general or on toast '~' It's not something you get where I am from, so my answer would be no. What would your answer be?
I don’t know like bread is made from yeast so I guess it can’t be too bad. I guess if I were you I would try it maybe its only found in Germany I am not very worldy so I would not know
Honestly I don't know. I don't really know what it is but I am sure it has lots of good things In it for your body. So put it on if you want to. Sorry for the short reasons I just don't know what it is.