Evaluating the Effectiveness of Colon Preparation for Endoscopy Using Specialized Clinical Nutrition

Inclusion Criteria: 1. Patients older than 18 years with the recommendation to conduct a diagnostic colonoscopy 2. Absence of contraindications to the use of specialized clinical nutrition products Exclusion Criteria: 1. Conditions which are contraindicated for colonoscopy: * The acute phase of cerebrovascular accident * Acute myocardial infarction * severe cardiovascular, pulmonary insufficiency and mixed * Violations of the cardiac rhythm (paroxysmal bradyarrhythmia, atrial fibrillation with atrial fibrillation or paroxysmal atrial fibrillation, severe transverse heart block) * Severe clinical forms (fulminant) inflammatory diseases of the colon (ulcerative colitis, Crohn's disease, ischemic colitis, radiation colitis, diverticulitis) * Aortic aneurysm or heart * Acute inflammatory infiltrates abdominal cavity (including diverticulitis) * Suspicion of abscess of the abdominal cavity * Peritonitis * Hepatosplenomegaly * Tense ascites * hydrothorax, hydropericardium * Severe blood coagulation * Hemorrhagic vasculitis 2. Pregnancy 3. The patient's refusal to participate in the study 4. Intolerance of specialized clinical nutrition products