Although antibiotics and antiseptics have been all the rage in our germ-fearing, cleanliness-obsessed society in recent years, many cultures have been relying on probiotics for centuries to promote good health. These potent, active microorganisms offer a host of benefits, including immune system support, cancer prevention and irritable bowel syndrome relief. Present in a normal digestive system, probiotics most commonly occur in yogurt and kefir; however, as they have been gaining popularity in the US, they can now be found in a range of products, including herbal supplements, kombucha, and even chocolate.