Kombucha

Kombucha

Kombucha tea, including the culture of bacteria and yeast, which is not usually consumed
Type	Flavored cold tea drink with fermentation byproducts
Country of origin	China
Alcohol by volume	<0.5% (commercial)
Proof (US)	<1 (commercial)
Color	Cloudy, commonly pale or dark brown and sometimes green
Flavor	Fermented, effervescent
Ingredients	Tea, sugar, bacteria, yeast
Variants	Fruit juices or spices added
Related products	Water kefir, kefir, kvass, beer, iced tea

Kombucha (also tea mushroom, tea fungus, or Manchurian mushroom when referring to the culture; Latin name Medusomyces gisevii)^[1] is a fermented, lightly effervescent, sweetened black tea drink. Sometimes the beverage is called kombucha tea to distinguish it from the culture of bacteria and yeast.^[2] Juice, spices, fruit or other flavorings are often added.

Kombucha is thought to have originated in China, where the drink is traditional.^[3][4] By the early 20th century it spread to Russia, then other parts of Eastern Europe and Germany.^[5] Kombucha is now homebrewed globally, and also bottled and sold commercially.^[1] The global kombucha market was worth approximately US$1.7 billion as of 2019^[update].^[6]

Kombucha is produced by symbiotic fermentation of sugared tea using a symbiotic culture of bacteria and yeast (SCOBY) commonly called a "mother" or "mushroom". The microbial populations in a SCOBY vary. The yeast component generally includes Saccharomyces cerevisiae, along with other species; the bacterial component almost always includes Gluconacetobacter xylinus to oxidize yeast-produced alcohols to acetic acid (and other acids).^[7] Although the SCOBY is commonly called "tea fungus" or "mushroom", it is actually "a symbiotic growth of acetic acid bacteria and osmophilic yeast species in a zoogleal mat [biofilm]".^[1] The living bacteria are said to be probiotic, one of the reasons for the popularity of the drink.^[8][9]

Numerous health benefits have been claimed to correlate with drinking kombucha;^[10] there is little evidence to support any of these claims.^[8][10][11] The beverage has caused rare serious adverse effects, possibly arising from contamination during home preparation.^[12][13] It is not recommended for therapeutic purposes.^[10][14]

Kombucha contains a small amount of caffeine.^[15][16]