I use rhamnosus in all my probiotics. I did find this as well from http://en.wikipedia.org/wiki/Lactobacillus_rhamnosus
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Risks
The use of Lactobacillus rhamnosus GG for probiotic therapy has been linked with very rare cases of sepsis in certain risk groups, primarily those immunocompromised or infants.[19] Ingestion of L. rhamnosus GG is, nevertheless, considered to be safe, and data from Finland show a significant growth in the consumption of L. rhamnosus GG at the population level has not led to an increase in the number of Lactobacillus bacteraemia cases.[20]