Cire shayi shine tsantsar ruwan shayi ko ruwan barasa.Yana da wadata a cikin abubuwan da ke cikin bioactive, ciki har da polyphenols shayi, L-theanine, alkaloids, polysaccharides shayi, saponins na shayi, bitamin, abubuwan ganowa da abubuwan ma'adinai.Yana da ayyuka na jinkirta tsufa, hana cututtuka na zuciya da jijiyoyin jini, rigakafi da magance ciwon daji, shakatawa, tsara mai da kuma taimakawa wajen narkewa.A asibiti, ana yawan amfani da shi a cikin ciwon kai, tashin hankali, barci, bacin rai da ƙishirwa, tara abinci da tsangwama, zazzabin cizon sauro, dysentery da sauran cututtuka.