Organic Barberry Root Bark Powder fights off infection of the urinary (bladder and urinary tract infections), gastrointestinal, and respiratory tracts (sore throat, nasal congestion, sinusitis, bronchitis), as well as candida (yeast) infections of the skin or vagina. Barberry extract may also improve. Helps skin problems. It improves symptoms faster than antibiotics and helps food poisoning and diarrhea while traveling.