Brenda Watson, founder of digestive supplement company ReNew Life and host of "The Road to Perfect Health" on PBS, is like the Dr. Oz of probiotics. According to SPINS, the company's probiotic sales experienced spikes during the PBS pledge months for Watson's show, suggesting that education is key to selling probiotics.

"Education brings sales," said Watson, ND, CNC. "If you educate, it naturally helps your sales. But it doesn't just help ReNew Life's sales—it helps the industry's sales." It's always been about education for Watson, who started lecturing in health foods stores in 1992. Watson took to PBS in 2006 and since has taped four shows focusing on her latest digestive health education initiatives. In her 20 years of experience as a natural healthcare practitioner, she's seen a lot of leaky guts.

Brenda WatsonIn "The Road to Perfect Health," her latest PBS show, Watson explains in layman's terms the benefits of probiotics. She's not allowed to recommend specific products, but she does make a case for probiotic supplements as opposed to foods such as yogurt. "America's very sick," she said. "Eating yogurt for them is like dropping salt in the ocean. It's going to do nothing for their health."

In the months prior to Watson's show airing during local PBS pledge drives, probiotics sales were growing at about 8.7 percent in the natural channel, said Bonnie Cooper, vice president of marketing for ReNew Life. When the show aired in the November-December 2010 timeframe, sales spiked to 21 percent and then leveled out to the teens, again spiking to 27 percent when the show aired in March.

"In the last nine months [we're seeing] a doubling of probiotic growth," said Cooper. "Nothing else has been in the media about probiotics, and we've seen the same thing happen with our sales doubling." Cooper said company revenue was growing at about 26 percent prior to the show, jumped to 76 percent in November/December, returned to 50 percent and then experienced 75 percent growth in March. In addition to probiotic supplements, ReNew Life sells herbal cleansing kits, digestive enzymes, oils such as omega-3s and fiber.