Changes

Isovaleric acid is widely thought to be an off-flavor in beer, particularly non-sour beer. It is also generally thought of as an off-flavor in kettle sours and in some mixed fermentation beers. However, many brewers find small amounts to be acceptable in mixed fermentation sour beers and lambics. Other brewers consider any amount of isovaleric acid to be an off-flavor in mixed fermentation sour beers and lambic, and they consider it a sign that the beer has not been allowed to age long enough <ref>[https://www.facebook.com/groups/MilkTheFunk/permalink/3752511238110396 Milk The Funk poll on whether or not isovaleric acid is considered an off-flavor and at what amounts. 08/08/2020.]</ref>.