What Are Tannins?

Tannins are a group of naturally occurring polyphenolic compounds found in many fruits, seeds, leaves, and bark. They are known for their bitter taste and astringent mouthfeel, often associated with red wine, cranberries, and certain teas. Tannins serve important protective functions in plants and have been studied for their potential roles in supporting human health.

Where Are Tannins Found?

• Cranberries: Rich in tannins, contributing to their tart flavor and antioxidant profile.
• Grapes: Especially red and Concord varieties, with tannins concentrated in the skins and seeds.
• Blueberries: Contain a mix of anthocyanins and tannins, offering color and health-supporting compounds.
• Blackberries: Known for their deep color and high tannin content.
• Pomegranates: Tannins are found in the peel and juice, contributing to their bold taste and richness.

Tannins also appear in nuts, teas, and cocoa, but fruit-based sources offer a flavorful way to include them in the diet. Visit our Fruit Juice Concentrates page to explore antioxidant-rich concentrates like cranberry and grape.

Functions and Potential Benefits of Tannins

• Antioxidant Activity: Help scavenge free radicals and support cellular defense.
• Digestive Support: May contribute to a healthy digestive environment by modulating enzyme activity.
• Oral Health: Astringent properties may assist in supporting gum and oral tissue health.
• Flavor and Astringency: Provide the bold, dry sensation associated with certain fruit juices and wines.

How to Include More Tannins in Your Diet

• Enjoy dark berries like blueberries and blackberries as snacks or smoothie ingredients
• Use cranberry juice concentrate for a tart addition to sparkling water or herbal teas
• Add Concord grape juice to sauces or vinaigrettes for rich flavor and tannin content
• Choose deeply colored fruits with a naturally bold, slightly bitter profile

Conclusion

Tannins are more than just flavor compounds—they are polyphenols with protective roles in nature and potential health benefits. Found in a wide variety of fruits, especially berries and grapes, tannins support antioxidant activity and help deliver complex taste. Including tannin-rich fruits and juices in your diet is a natural way to enjoy both flavor and function.