Table 2: Some constituents of Kombucha related to health claims and their recommended values for consumption.

Chemical constituentAmount present in Kombucha green tea (g/L)Amount present in Kombucha black tea (g/L)Recommended maximum level as per standard guidelinesLD50 value in rats via oral route (mg/kg of body weight)

Acetic acid9.51 ± 0.35 (on day 15) [33]6.17 ± 0.3 (on day 15) [33]2.1 g per day [62]3310 [63]

Glucuronic acid1.57 ± 0.14 (on day 15) [33]1.5 ± 0.17 (on day 15) [33]Not availableNot available

Lactic acid0.15 ± 0.02 (on day 15) [33]0.33 ± 0.07 (on day 15) [33]FDA requirement substance added directly to the human food affirmed as generally recognized as safe (GRAS) [64]3730 [65]

Citric acidNot availableNot available3000 mg/kg per day [66]3000 [67]

Oxalic acid0.03 (on day 3) [33]0.11 (on day 3) [33]0.14 mg/kg per day (the scientific basis for this conclusion is not available and therefore no safe dietary dose for oxalic acid can be established) [68]7500 [69]

AcetaldehydeNot availableNot available0–2.5 mg/kg per day [70]661 [71]