One of the crucial tasks in the field of protection of the society is developing methods for the purpose of preventing occurrence on the product market, which do not correspond with legislation. Hence, there is a constant need for the development of quick and reliable methods in controlling the accuracy of food products. Frequently, in the Dairy industry, powdered milk is reconstructed because of its expired date and added to the pasteurized or sterilized milk and without it being rightfully labelled is put on the market, misleading the consumers. The consumers have the right to know what can be found in their food, while the manufacturers are obliged to inform and not mislead about the ingredients of the product; the characteristics of the food, especially its natural state, its identity and origin, its properties, its quantity, its durability as well as the process of production. The aim of this paper was to check validation of the labelling of the store-bought milk and to ascertain possible adulterating by adding powdered milk. The samples for this paper were purchased from retailers. Determining of the possible adulterating milk by adding powdered milk was carried out with the modified spectrophotometry, while the accuracy of its labelling was verified by the physical chemistry method in The Reference laboratory for milk and dairy products, Department of Dairy Science, University of Zagreb Faculty of Agriculture. Based on analysed samples of milk we got the following data. Of 15 samples in total, only 4 samples match formal legislation and given values on the product’s label. Furthermore, by analysing a freezing point as a way of controlling the adulterating of milk with water, the adulteration has been established in 3 samples. Adulterating milk by adding reconstructed powdered milk has not been stated in any analysed sample. As we can see from obtained results, it is essential to establish control of authenticity of labelling along with control of adulteration of milk to prevent falsehood when dealing with food and deceit of the consumer.