The QS certification mark can be found on many fresh foods in over 25,000 food retail markets, such as on meat, meat products and cold cuts as well as on fresh fruit, vegetables, potatoes and kitchen herbs that are offered fresh. German as well as foreign products can be labeled with the QS certification mark. Other foods - such as milk, fish and eggs - however bear no QS certification mark. In principle, only products that have been produced and marketed according to the requirements of the QS scheme may be labelled with the QS certification mark.
Further information about the QS certification mark can be found here.