Recombinant Human Serum Albumin(Protgen Ltd.)

This clinical trial is an open-label, parallel-group, exploratory study of recombinant human serum albumin (rHSA, hereafter referred to as the "investigational drug") in patients with mild to moderate Alzheimer's Disease (AD). It aims to enroll 30 subjects who meet the 2011 National Institute on Aging and Alzheimer's Association (NIA-AA) criteria for "Probable AD Dementia." Participants will be randomized in a 1:1:1 ratio to receive the investigational drug at doses of 20g, 30g, or 40g, for assessments of safety and preliminary efficacy. Stratification factors will be based on the severity classification (mild; moderate) as indicated by the total score on the Clinical Dementia Rating Scale - Global Score (CDR-GS) during the screening period.