'''Safety warning''': not all plants are safe to consume! Do your research first before incorporating plants into your beer. Be 100% sure of the identification of the plant. Just because a particular plant was consumed historically before science had an understanding of what the effects were doesn't mean you should disregard the modern understanding of health and medicine. See [http://www.theoreticales.com/herbal-beer-resource---edible-plant-link-index.html Alex Seitz's resources and guide to edible/poisonous plants].
In 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. 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].
==Spices==