Yeast is everywhere. Basically, anywhere there is a carbohydrate (sugar) source, you will probably find yeast. It was discovered by pre-Neolithic populations and therefore, yeast can be considered as man’s oldest domesticated microorganism.
Today, it is well known that yeast is a key ingredient of bread and bakery foods. But its role goes far beyond this, and many other products also contain yeast: fermented drinks such as alcohol beverages such as beers, wines or distilled spirits, salad dressings, seasonings, soups and savoury creams, probiotic products, dietary supplements for humans and animals, and more.