GOOD-FOR-YOU BACTERIA

Probiotics, beneficial bacteria that normally live in your gut, are thought to promote digestive health and a strong immune system. They’re usually found in yogurt, kefir and other fermented dairy products, but they are also sold as supplements, and manufacturers now add them to bars, cookies, granola, juices and tea.

The two most widely studied strains of products are from the lactobacillus and bifidobacterium genera. Some of the possible benefits: The Natural Medicines Comprehensive Database, an independent research group that evaluates natural products, says that certain strains of lactobacillus are likely effective for diarrhea.

Some strains are possibly effective against irritable bowel syndrome (IBS).
Other strains are possibly effective in reducing the severity of respiratory infections in children and may lower high cholesterol (LDL).

How to Choose: Look for the Live & Active Cultures seal from the Natural Yogurt Association, which indicates that the product contained viable bacteria when it was manufactured. Stick to the well-studied ones such as Culturelle (lactobacillusGG). Store probiotics carefully since they can lose effectiveness over time. If you are taking antibiotic medications, probiotics are likely to survive if you consume them at least two hours before or after the antibiotic. Some of these products can cause gas for a few days. People with suppressed immunity or ill should talk to their doctor before trying probiotics. Consumer Reports on Health, November 2010.