千層塔精華(石杉鹼甲)是從植物蛇足石杉所提取的一種化學物質。根據中國一些臨牀研究發現,它有助提高記憶力,對血管性記憶力衰退和阿爾茨海症(俗稱老人癡呆)都有明顯功效。然而,科學家還需要更多的研究來肯定有關研究成果。
Huperzine A, a chemical made from the plant Huperzia serrata, may improve memory in both vascular and Alzheimer's dementia, according to several studies in China. However, more studies are needed to know for sure.
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