If you've ever seen a yogurt commercial, you've likely heard about probiotics. But is yogurt the best source of these beneficial bacteria? Should you take additional probiotics and why? Donald Brown, ND, is an expert on this topic and offers some practical advice for anyone who is interested in getting more good bacteria.

Donald J. Brown, ND, is one of the leading authorities in the United States on the safety and efficacy of dietary supplements, evidence-based herbal medicine and probiotics. He is a naturopathic physician and received his degree from Bastyr University. Brown currently serves as the director of Natural Product Research Consultants (NPRC). Founded in 1990, NPRC has provided consulting for companies in the natural products and pharmaceutical industies, as well as education for healthcare professionals, the natural products industry and consumers.