i don't know, i never drink the broth because for some reason it always taste bad, but i just boil the noodles, along with cabbage, green onions/other various vegetables, drain, season& add soy sauce.
I don't know i find it pretty good, also if i don't have cabbage i usually just add potato and eggs instead, and make my own broth for it. turns out quite nice, although i do think i should just go to the oriental supermarket and get a ton of high quality noodles instead.