長柄千層塔(學名:Huperzia serrata),臺灣話又稱龍鱗草(Lîng-lân-tsháu)、七寸金(Tshit-tshùn-kim)、金不換(Kim-put-huàn)[1],為石松科石杉屬下的一個種,含有石杉鹼甲這種生物鹼可以抑制乙醯膽鹼酯酶活性,作為一種號稱可益智的非處方補劑售賣。[2][3]
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