Keywords: AD; Alzheimer's disease; PPs; polyphenols; EGCG; epigallocatechin gallate; NFTs; neurofibrillary tangles; ACh; acetylcholine; Aβ; amyloid-beta; APP; amyloid precursor protein; PS-1; presenilin-1; PS-2; presenilin-2; AChE; acetylcholine esterase; Cdk5;