In December 2017 researchers from Egypt, Syria, Japan and Vietnam reviewed the scientific literature to assess the effect of probiotics in rheumatoid arthritis. Nine studies involving 361 patients were identified. Research showed that the inflammatory marker was significantly lower in those taking probiotics when compared to those taking a placebo. However, there was no difference between probiotics and placebo in disease activity score.
Mohammed AT et al. The therapeutic effect of probiotics on rheumatoid arthritis: a systematic review and meta-analysis of randomized control trials. Clin Rheumatol. 2017 Dec;36(12):2697-2707