Tannins

Tannins are present in tea, coffee, cocoa and sorghums. Experimentally they have been shown to interfere with digestibility of proteins, but there is no evidence that they produce an adverse effect in humans.² (Tannins have been found to be carcinogenic when injected in experimental animals.⁴)

References
Back to List of Endogenous Plant Toxins

Prepared Summer 1997 by Bernadene Magnuson, Ph.D.
University of Idaho, Dept. of Food Science and Toxicology - EXTOXNET FAQ Team.