Evaluation of the Effect of L-Arginine on the Cognitive Function in Geriatric Patients

Inclusion Criteria: * Age \>60 years * Montreal Cognitive Assessment (MoCA) test score from 10-25 (mild to moderate cognitive impairment) Exclusion Criteria: * Presence of neurodegenerative diseases (e.g.: Alzheimer's disease, Parkinson's disease, Huntington's disease, Multiple Sclerosis) * Patients with history of L-arginine intolerance or allergy * Patients with asthma * Patients who recently had an acute myocardial infarction * Patients with history of stroke within 1 yaear * Patients who started or discontinued medications that may affect cognitive function (e.g., CNS psychotropics, antihistamines, or acetylcholinesterase inhibitors) during the study period. * Patients who initiated or stopped antihypertensive medications during the study period. * Patients who initiated or stopped antidiabetic medications during the study period. * Patients who initiated or stopped antihyperlipidemic medications during the study period. * Patients prescribed medications for depression, anxiety, or stress that may impact cognitive function * Patients on nitrates, phosphodiesterase-5 inhibitors, potassium sparing diuretics * Refusal to provide written informed consent