I went to the supermarket and purchased Marmite today.
Marmite is fortified with vitamin B12 as well as iron.
It’s important that vegans get vitamin B12 from supplements or fortified food because there is no vitamin B12 in plant food.
If taking supplements, aim to take between 100 to 300 micrograms of vitamin B12 per day.
Although plant food can provide vitamin B12 if it has been contaminated with bacteria from soil, plant food nowadays is washed clean thereby removing vitamin B12.
Meat from grass-fed animals contain vitamin B12 as the bacteria that produces vitamin B12 from the dirt on grass is consumed by the animal. However, nowadays livestock is fed with processed grains, and meat from factory farms typically do not have vitamin B12. As such, 90% of vitamin B12 supplements are fed to livestock, not humans.