Marmite is rich in B vitamins including thiamin (B1), riboflavin (B2), niacin (B3), folic acid (B9) and vitamin B12.
Marmite should be avoided if a person takes a MAOI antidepressant, such as phenelzine (Nardil) or tranylcypromine (Parnate), as yeast extracts interact negatively with these types of medications due to their tyramine content [REF].