It is well-known that aviculture products are recommended for all groups of people, especially old ones, people with diseases, and children. For this purpose quail meat is practically the best one for consumption, especially as quails are easy to breed. However quails are susceptible to different stress factors which negatively affect their health, productivity and the quality of meat products. There is a worldwide concept – a total ban of growth promoters is practically impossible. Therefore, a solution to this problem could be the elaboration and usage of biologically active compounds harmless to human and animal health, such as BioR, obtained from the cyanobacterium Spirulina platensis. The main goal of our study was the assessment of the influence of BioR on the liver functional status in adult quails. The study was conducted on 3 groups of birds, 80 birds each. Two groups received intramuscularly BioR, 0,5 ml /head. The birds of the experimental group 1 received the tested product twice consecutively, while the experimental group 2 – only once, at the beginning of the study. The control group was administered saline in dose of 0,5 ml/head. Quails were permanently monitored, individually weighed, and eggs counted. There were not registered side effects or mass diseases during the whole study. So BioR exerted a beneficial effect on the physiological and metabolic processes in the body of quails, especially on the functional status of liver. The tested remedy induced several changes in the biochemical parameters: total bilirubin level decreased by 5,8 – 9,3%; indirect bilirubin level decreased by 27,2 – 51,3%; direct bilirubin increased by 12,9 – 27,1%; cholesterol and triglycerides decreased by 6,9 – 11,8% and respectively by 1,8 – 1,84 times compared to the control group, results that reflect the metabolic processes intensification in the liver. It is significant that some marker parameters of functional liver status increased unequivocal. Thus, the level of alkaline phosphatase in birds treated with BioR was by 31,5 – 32,4% higher than in the control group, the same dynamic being registered for thermostable and labile fractions. An important criterion in the assessment of liver function is the serum pseudocholinesterase, which in the groups treated with BioR increased by 1,3–1,5 times compared to the control group, parameter that confirms the above specified, highlighting the improvement of the liver proteosynthetic function.