Sabuwar gwaji da aka gudanar kwanan nan ya nuna cewa shan kofe (6 mg/kg) kafin motsa jiki yana ƙara alamun ɗaurewar hanyoyin jini cikin awa 2.5. Amma idan aka haɗa da furen beetroot wanda ke ɗauke da nitrate 400 mg, waɗannan alamun sun dawo kamar yadda placebo ke nuna. Matsin jini da aikin endothelium ba su canza ba, don haka tasirin ba shi da babbar illa. Gwajin ya ƙunshi mutane 24 masu lafiya, amma har yanzu akwai tambayoyi kan sakamakon dogon lokaci da tasirin ga manya ko masu hawan jini.
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