Clinical Study to Assess the Long-term Effect of Pep2Dia® on Glucose Homeostasis in Prediabetic Subjects

Inclusion Criteria: * Male and female subjects (minimum one third of each gender) with prediabetic HbA1c values between 5.7% and 6.4% and/or fasting glucose ≥ 5.6 mmol/L (≥ 100 mg/dL) and \< 7.0 mmol/L (\< 125 mg/dL) (in venous plasma) (twice confirmed at two independent days if HbA1c is \< 5.7%) * Age: 25-70 years * Body mass index 19-35 kg/m2 * Current Non-smoker * Availability and presence in the study units for approx. 3.5 hours/ week for 2 times. * Signed informed consent form * No changes in food habits or physical activity 3 months prior to screening and during the study * If applicable, stable intake of chronic medication of at least 4 weeks Exclusion Criteria: * Subjects with diagnosed Type 2-Diabetes with medical treatment * Presence of disease or drug(s) influencing digestion and absorption of nutrients * Intake of medications known to affect glucose tolerance, e.g., diabetic medication SGLT-2 inhibitors, GLP-1 receptor agonists, steroids, protease inhibitors or antipsychotics * Chronic intake of substances affecting blood coagulation (e.g. acetylic acid (100 mg as standard prophylactic treatment allowed when dose is stable 1 month prior to screening), anticoagulants, diuretics, thiazides (diuretics and thiazides allowed e.g. for hypertension treatment when dose is stable 1 month prior to screening)), which in the Investigator's opinion would impact patient safety * Severe liver or renal disease or laboratory evidence of hepatic dysfunction (i.e. alkaline phosphatase, ALT, AST \>3 x ULN) * Acute gastrointestinal diseases including diarrhea and/or vomiting within the last 2 weeks * Known inflammatory or malignant gastrointestinal diseases (i.e. colitis ulcerosa, Morbus Crohn, celiac disease, malignant diseases e.g. colon-cancer, rectum cancer, pancreatitis) * Clinically relevant findings as established by medical history, physical examination, clinical laboratory and/or vital signs * Major medical or surgical event requiring hospitalization within the previous 3 months * Intake of food supplements known to affect glucose tolerance, e.g., cinnamon capsules, conjugated linoleic acids, omega-3 fatty acids * Intake of antibiotics within 4 weeks before the test days * Known alcohol abuse or drug abuse * Pregnant or breast-feeding women * Weight loss intervention or recent body weight change \>5 kg during last 3 months * Known or suspected allergy to any component of the investigational product(s) (e.g. milk protein) * Blood donation within 4 weeks prior to Visit 1 or during the study * Anticipating any planned changes in lifestyle for the duration of the study * Participation in another clinical intervention study within the last 4 weeks and concurrent participation in another intervention clinical study * Subject unable to co-operate adequately