Diseases caused by or associated with a lack of proteins and vitamins of group B: stressful situations (use of antibiotics, chemotherapeutic agents, vaccination, etc.); general weakness (anemia, diarrhea, vomiting, toxicosis, diseases of digestive and respiratory organs, surgical manipulations, etc.); increased protein consumption (pregnancy, breastfeeding period, overwork); - growth and development disorders, recovery from chronic diseases, lack of appetite.