Icyayi gikuramo amazi cyangwa ikinyobwa cyicyayi.Ikungahaye kuri bioactive, harimo icyayi cya polifenol, L-theanine, alkaloide, icyayi polysaccharide, icyayi saponine, vitamine, ibintu bya minisiteri.Ifite imirimo yo gutinza gusaza, guhagarika indwara zifata umutima, kwirinda no kuvura kanseri, kugarura ubuyanja, kugenzura ibinure no gufasha igogora.Mubuvuzi, bukunze gukoreshwa mububabare bwumutwe, umutwe, gusinzira, kubabara no kunyota, kwegeranya ibiryo no guhagarara kwa flegm, malariya, dysentery nizindi syndromes.