They are made from a single-celled organism fungi called Saccharomyces cerevisiae grown on molasses. They are fortified with vitamins in the initial stages of growth. As the yeast grows they organically bind to these vitamins and proliferate them. The yeast itself also digests these vitamins to a degree and proliferates its own nutrient content creating a naturally vitamin rich food that can easily be incorporated into all savoury meals. The yeast is then harvested, washed and dried with heat to ‘deactivate’ them and then rolled to form flakes.