Whey yog ib tug by-product ntawm zus tau cov cheese los yog casein, whey tag nrho cov khib nyiab txhawm rau ib nrab ntawm tag nrho cov teeb meem qhuav ntawm mis nyuj, nws lub ntsiab yam yog lactose, whey protein, cov zaub mov thiab lwm yam. Whey protein tso nyiaj rau 20% ntawm tag nrho cov protein ntau mis, thiab cov vitamins thiab minerals hauv mis nyuj kuj muaj nyob rau hauv whey.
Muaj ib qho khoom noj khoom haus muaj nqis heev. Los ntawm kev siv zom cheese, nqaij nyug cheese, cheese thiab trombin casein uas tau los ntawm cov khoom siv uas hu ua Swey Whey, nws qhov nqi ntawm 5.9 ~ 6.6; hydrochloric acid precipitation manufacturing casein thiab tau whey nws tus nqi phom ntawm 4.3 ~ 4.6, rau cov kua qaub av xiav.