Wani sabon bincike da aka wallafa a mujallar *Nature* daga Harvard ya gano cewa **lithium** ne kadai ƙarfe da ya ragu ƙwarai a kwakwalwan mutanen da ke da matsakaicin rauni na tunani (MCI). A lokacin da aka rage lithium a ƙwayoyin berayen, an ga ƙaruwar amyloid‑beta, ƙaruwar phosphorylated tau, kumburi, da asarar ƙwaƙwalwa. Sake ba da lithium a sifar **lithium orotate** ya dakatar da waɗannan al'amura. Sai dai sakamakon ya samo ne daga gwaje‑gwajen dabbobi kawai, babu gwajin ɗan adam, kuma lithium na da haɗari ga koda, thyroid da wasu magunguna.
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