Efficacy and Safety of 1612 Capsules in aMnestic Mild Cognitive Impairment

Inclusion Criteria: Patients should be enrolled if they met the following criteria\[14\]: 1. cognitive complaints from the patients or their families; 2. objective evidence for memory impairment, delayed story recall test(DSR)\<12.6(age50-64 less than15.5,65-74less than 12.5,older 75 less than10); 3. normal general cognitive function, with Mini-Mental State Examination (MMSE) score of between 24 and 30 (including 30); 4. preservation of activities of daily living, with Alzheimer's Disease Cooperative Study/Activities of Daily Living scale adapted for MCI patients (ADCS/MCI/ADL24) score between 38 and 52; 5. cognitive disorders as evidenced by clinical evaluation, with clinical dementia rating scale=0.5,memory domain = 0.5; 6. absence of dementia, not sufficiently impaired cognitively and functionally to meet DSM-IV criteria, 7. enough vision and hearing to accomplishment neuropsychological test; 8. capability to read words and write simple sentence; 9. capability and willingness to give informed consent and to comply with the study procedures. Exclusion Criteria: The patients would be ineligible if they had the following conditions: 1. non amnestic Mild cognitive impairment; 2. meeting the diagnostic criteria for dementia; 3. cognitive impairment resulting from conditions such as acute cerebral trauma, cerebral damage due to a lack of oxygen, epilepsy vitamin deficiency, infections such as meningitis or AIDS, significant endocrine or metabolic disease, mental retardation, or a brain tumor ,or drug abuse or alcohol abuse 4. having significant psychiatric disease, depression, the Hamilton depression scale \>12; CT or MRI scan showed central nervous system infections Infarction or focal lesions within 12 months，the Hachinski Ischemic Scale (HIS)\>4; 5. combined following disease: diabetes; poor controlled hypertension or severe arrhythmias; or suffered from heart infarction within 3 months; severe asthma or COPD; severe indigestion; gastrointestinal tract obstruction; gastroduodenal ulcer; 6. used cholinesterase inhibitors or memantine within 1 month; 7. history of hypersensitivity to the treatment drugs; 8. concomitant drugs with the potential to interfere with cognition; 9. administration of other investigational drugs; severe impairment of the functions of the kidney or liver; 10. vegetarians or contraindications for animal innards.