Gami-Chunghyuldan ameliorates memory impairment and neurodegeneration induced by intrahippocampal Aβ1-42 oligomer injection

► GCD rescues cognitive impairment induced by AβO. ► GCD protects against AβO-induced hippocampal cell loss. ► GCD inhibits AβO-induced astrogliosis and microgliosis in the hippocampus. ► GCD protects against a decline in cholinergic synaptic density in the hippocampus.