Consumption of both black tea and green tea results in an increase in the excretion of hippuric acid into urine.

@article{Mulder2005ConsumptionOB,
  title={Consumption of both black tea and green tea results in an increase in the excretion of hippuric acid into urine.},
  author={Theo P. J. Mulder and Anton G. Rietveld and Johan M M van Amelsvoort},
  journal={The American journal of clinical nutrition},
  year={2005},
  volume={81 1 Suppl},
  pages={256S-260S}
}
BACKGROUND A major portion of the catechins in green tea is not absorbed in the small intestine. Bacteria in the colon convert nonabsorbed catechins into simpler phenolic compounds, which may also be absorbed. During the production of black tea, most catechins are polymerized to complex molecules called thearubigins. Little is known about the microbial degradation of these complex polyphenols, but hippuric acid has been identified as a major excretion product associated with black tea… CONTINUE READING

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