Icyayi gikuramo amazi nigikuramo amazi cyangwa inzoga zicyayi.Ikungahaye ku binyabuzima, harimo icyayi cya polifenol, L-theanine, alkaloide, icyayi polysaccharide, icyayi saponine, vitamine, ibintu bya minisiteri.Ifite imirimo yo gutinza gusaza, kubuza indwara z'umutima-damura, kwirinda no kuvura kanseri, kugarura ubuyanja, kugenzura ibinure no gufasha igogorwa.Mubuvuzi, bukunze gukoreshwa mububabare bwumutwe, umutwe, gusinzira, kubabara no kunyota, kwegeranya ibiryo no guhagarara kwa flegm, malariya, dysentery nizindi syndromes.