|This article/section is a stub — probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. (Feel free to ignore, fix, or tell me)|
Monosodium glutamate (a.k.a. MSG, ve-tsin, E621) is a salt (chemically and taste-wise) that is marketed as a flavour enhancer.
It is associated with Chinese food, but also in western items like some chips (e.g. Doritos), some condiments, some canned soups. some fast food chicken, some processed meat.
Some people dislike it over the fact that it mostly seems to makes you thirsty, and that some people use too much of it - very little is needed or it will overpower.