Your Ultimate Defense Against Candida Overgrowth Candida is an opportunistic yeast naturally found in the digestive tract and on the skin. Candida overgrowth in the digestive tract and systemic Candida overgrowth throughout the body can affect every level of health—from your digestion to your mood. In those with a compromised immune system, Candida overgrowth is the most common infection in intensive care units.1 Candida is also the fourth most common infection picked up at hospitals.2 According to a report published by the United States Centers for Disease Control and Prevention (CDC), Candida is increasingly resistant to drug therapy—making it a “serious threat” to the American public, along with general antibiotic resistance.