Preliminary Safety and Efficacy Study of Extracellular Vesicle Infusion in the Intervention of Age-related Phenotypes With Impaired Glucose Tolerance.

Inclusion Criteria: 1. The subjects are between 35 and 65 years old (inclusive), regardless of gender; 2. The subject's body mass index (BMI) is between 20kg/m2 and 30 kg/m2; 3. The subjects were assessed by the clinical expert group as having abnormal glucose tolerance (PPG 7.8-11.0mmol/L 2h postprandial); 4. Subjects voluntarily participate in this clinical study and sign a written informed consent. Exclusion Criteria: 1. The subject has a severe allergy or is allergic to any component used in cell culture; 2. The subject has used or is using drugs that affect glucose metabolism (such as glucocorticoids, tricyclic antidepressants, etc.) within 1 month; 3. The subjects have chronic diseases such as diabetes and hypertension (very high-risk group) which have not been effectively controlled after treatment; 4. Subjects with severe cardiovascular and cerebrovascular diseases: patients with a history of decompensated cardiac insufficiency (NYHA grade Ⅲ or Ⅳ), myocardial infarction or cerebral infarction, or cerebral hemorrhage within 6 months before screening; 5. The subjects had abnormal liver function (ALT and/or AST≥ 2.5 times the upper limit of normal), significant abnormal renal function, male serum creatinine ≥1.5mg/dl, female serum creatinine ≥1.4mg/dl; 6, the subject's HIV antibody, hepatitis B surface antigen, hepatitis C antibody, syphilis test positive, hepatitis B virus DNA quantitative \> the upper limit of normal test unit; 7\. Subjects with other serious systemic diseases affecting the study, including malignant tumors, nervous central system, blood system, digestive system, endocrine system, respiratory system, infectious diseases, etc.; (8) Drug or alcohol abuse (subjects who consumed \>2 alcoholic beverages per day or \>14 alcoholic beverages per week (one alcoholic beverage is defined as 150ml of wine, 350ml of beer, or 50ml of 80% (40 proof) spirits); Or drug abusers; 9. Pregnant and lactating women; Have a pregnancy plan in the next 2 years (including the spouse's pregnancy plan); Refusal to use effective contraception; 10. Exclude intracranial lesions and early lung tumors; 11. Used stem cell (exosome) therapy or participated in stem cell (exosome) clinical researchers 3 months before screening; Clinical investigators who have participated in drugs within 3 months before screening; 12. High risk groups with Padua score ≥4 or Caprini score ≥5; 13. The subject has a history of major surgery within the past six months or is expected to have surgery within six months; 14. There are other conditions that the researcher considers inappropriate to participate in this clinical study.