15/06/2026
PLANT TOXINS: Tannins
Sources
Tannins are polyphenolic compounds found in:
Tea (especially black tea)
Coffee (contains related polyphenols more than true tannins)
Cocoa
Sorghum
Some nuts and legumes
Red wine
Effects
They can bind iron in the digestive tract, forming complexes that are harder to absorb.
They can bind to protein too