Tannic acid is a type of polyphenol found in various plants, particularly in the bark, leaves, and fruits. It is known for its astringent properties, which can cause tissues to contract and dry out. Tannic acid is commonly used in the production of leather and in the food industry as a preservative and flavoring agent. In addition to its industrial uses, tannic acid has potential health benefits. It is believed to have antioxidant properties, which can help protect cells from damage. Some studies suggest that it may also have antimicrobial effects, making it of interest in natural medicine and herbal remedies.