The paper presents the results of research and production experience at ALLC "Hliborob" Vinnytsia oblast on studying the milk qualitative composition and cows productivity after consuming a complex of mineral substances CuSO4 40 mg, Zn SO4 1200mg, MnSO4 1300mg, CoCl2 30mg, KI with feeds per day/ head, as well as mineral additive with aminoacids and selenium "Nutricell" at a doze of 2 gr per day per head. A daily average milk yield, determined before the research, proves that the choice of animals in control and in experimental groups was done with due regards to milk productivity. It has been determined that a daily milk yield of cows of the experimental group increased by 4.7%. The quality analysis of milk received from the cows of experimental and control groups testifies to its compliance with the GOST 3662:2018. According to the organoleptic parameters, all milk samples were a homogeneous liquid from white to light-cream colours, without any albumen flakes.The flavour is clear, common to fresh milk, without any side-flavours. According to the purity level, all milk samples corresponded to group 1. Density analysis shows that the given parameter corresponds to norms. But it is necessary to admit that according to this parameter the milk of a control group at the end of the research corresponded to a highest grade, according to an above mentioned GOST, and the milk of an experimental group corresponded to extra-class milk. The mass fat amount and albumen content in the milk samples of experimental group animals tended to increase. The titrated acidity and the bacterial contamination of the samples also corresponded to national standards requirements on extra-class level. It testfies to a high sanitary culture level and keeping to a high sanitary and productive practice levels (GHP/GMP).