There is increasing evidence that probiotics are beneficial in a range of gastrointestinal conditions, including infectious diarrhoea and that related to antibiotic use.1 Probiotics are defined as “live micro-organisms which when administered in adequate amounts confer a health benefit on the host”2 and include Streptococcus thermophilus, Enterococcus species, Saccharomyces species, and various species of lactobacilli and bifidobacteria.