ACHE and Alzheimer disease: It was not surprising to see that the amyloid beta + NAT 30 mg/kg (0.006410 ± 0.0001721 vs. 0.009173 ± 0.0001497, p<0.0001) and amyloid beta + NAT 50 mg/kg group (0.005985 ± 0.0001044 vs. 0.009173 ± 0.0001497, p<0.0001, F (3, 12) = 41.97) significantly reduced the levels of AChE as compared to the amyloid beta group, suggesting their neuroprotective role in the conditions of AD.