Spermidine, tseem hu ua spermidine dihydrochloride, yog hom polyamine. Kev faib tawm dav hauv cov kab mob, nws yog biosynthesized los ntawm putrescine (butylamine) thiab adenosylmethionine. Spermidine tuaj yeem inhibit neuronal synthase, khi thiab precipitate DNA; Nws tseem tuaj yeem siv los ua kom huv DNA khi cov proteins thiab txhawb nqa T4 polynucleotide kinase kev ua haujlwm. Thaum lub Cuaj Hlis 1, 2013, cov kws tshawb fawb los ntawm lub teb chaws Yelemees thiab Austria tau koom tes los kawm tias spermidine tuaj yeem tiv thaiv qhov pib ntawm Alzheimer's disease.