Tannins in plants are stored in an organelle derived from chloroplasts. They are enclosed in cellular fluid and do not interact with proteins and other nutrients, so they do not interfere with plant metabolism. In the past, tannin was limited to the “anti-nutrient factor” in feed. In recent years, it has been found that tannin has a special astringent and anti-diarrhea effect on the intestinal tract of animals, which can inhibit pathogenic microorganisms and enhance the antioxidant, antiviral and anti-cancer capabilities of animals. Tannins are currently approved by the US Food and Drug Administration (FDA) as a food additive added to beverages and meat products.
read more..