Berberine is an alkaloid substance found in several genus Berberis plants, such as barberry. This substance has been traditionally used to alleviate digestive issues, as an antiseptic for the urinary tract, and to support cardiovascular and metabolic health. It is also included in Ayurvedic pharmacopoeia.
As an ingredient in topical products, with other ingredients, it helps to soothe the pain and redness caused by burns and canker sores. If in doubt when using a product containing berberine, it is advisable to consult a healthcare professional.