Bugs in baby food? Microbes in your milkshake? Relax, this is not the latest tainted food scare — it’s a growing trend in foods designed to boost health, not make you sick. These products contain probiotics, or “friendly” bacteria similar to those found in the human digestive system.

There are supplement pills, yogurts, smoothies, snack bars and cereals, even baby formula and chocolate. Sold by major names like Dannon and Kraft, they’re spreading like germs on grocery store shelves and in supermarket dairy cases. And they come with vague health claims of “regulating your digestive health” or “strengthening your body’s defenses”.

Experts say probiotics are generally safe, and in some cases might be helpful.

More research is needed, and it’s a hot new area, reflecting a growing understanding of the role that naturally occurring intestinal bacteria play in health.

The market is ahead of the science. It’s all part of an effort to capitalise on the obsession with health foods. Probiotics are already popular in Europe, Asia and South America.

So far this year, more than 150 probiotic and prebiotic commercial food products have been introduced in the US, compared with about 100 last year and just 40 in 2005, said Tom Vierhile of Datamonitor, a market research firm.

“It is definitely a growing trend,” Vierhile said Holly Maloney, a nutrition instructor at Chicago’s Kendall College. She’s a longtime fan of yogurt and kefir, a probiotic-containing fermented milk drink. “It just makes me feel good,” Maloney said of the products.

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