The investigators performed a randomized, placebo-controlled, double-blind study on evaluating effect of Yi-Zhi-An-Shen Granules on cognition, sleep quality, and gut microbiome of older adults with amnestic mild cognitive impairment (aMCI). The investigators plan to involve 80 cases for observation in 2 years (40 cases for each group), expecting that cognition and sleep quality of aMCI patients can be improved by Yi-Zhi-An-Shen Granules versus placebo, and discussing the differences between individuals with aMCI and ones with normal cognition, also investigating whether this Chinese medicine compound can regulate gut microbiome of older individuals with aMCI.
The main purpose of this study is to investigate the safety and efficacy of Yi-Zhi-An-Shen Granules in participants with amnestic mild cognitive impairment (aMCI).