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Another study, by M. Deghrigue et al. (2013), found that while black tea kombucha was effective aganst one of two types of human lung cancer cells, green tea kombucha was more effective against both in Vitro. While the researchers weren’t sure by what mechanism the anti-cancer properties were achieved, attributing it potentially to polyphenols and other antioxidants, others have speculated that it could be due to metabolites (e.g., alcohol, organic acids, vitamins, amino …