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added Michael Thorpe's TTB Formlua Spreadsheet
The acidity and fruity characteristics in many mixed-fermentation beers make them good candidates for fruit additions. It is not recommended to put fruit into a beer to cover up some major flaw or off character-flavor. Fruit can complement a good beer but it will likely not fix problems. Quality fruit is expensive and you'll want to start from a good base if you are going to invest the time and money in good fruit for a beer.
Some producers use the term maceration to describe the addition of fruit or herbs to a beer. Maceration in beer is the extraction of flavor-active and colored compounds as well as other constituents of fruits and herbs by soaking them in the beer. The rate at which compounds are extracted during maceration depends on factors such as temperature and pH.
For commercial brewers in the US, any ingredient not on the [https://www.fda.gov/food/ingredientspackaginglabeling/gras/ucm083022.htm GRAS] or [https://www.ttb.gov/beer/exempt-ingre.shtml TTB exempt] lists needs to be approved by the TTB regardless of where the beer is sold. When seeking approval, it is helpful to show previous use and scientific articles supporting the safety of consumption of the ingredient being used. Provide this information for the FDA GRAS department and then have them work with the TTB for approval. See also [https://www.ecfr.gov/cgi-bin/text-idx?c=ecfr&sid=bd3ebd8d0f96086d22829fda14923623&rgn=div5&view=text&node=27:1.0.1.1.20&idno=27#sg27.1.25_153.sg4 ''Formulas for fermented products'' on GPO.gov].
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Michael Thorpe and Milk The Funk maintain a list of ingredients that have been approved by the TTB for a specific brewery to use, but are not on the exempt lists. Help us out by adding your TTB approved ingredient to the list, or use this list to help you get approval for an ingredient that your brewery uses.
[https://www.facebook.com/groups/MilkTheFunk/permalink/2249190315109170 '''TTB Formula Approvals Spredsheet''']
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==When To Add Fruit==