| Study | Reason For Exclusion |
| Biancone 2003 | No control group |
| Bjarnason 2005 | Lacks appropriate outcome measure for CD |
| Bousvarous 2005 | Population investigated is children |
| Bruyn 2021 | Intervention not classified as probiotic |
| Chermesh 2007 | Outcome not reported for treatment group |
| Garcia Vilela 2008 | Lacks appropriate outcome measure for CD |
| Gupta 2000 | No control group/not randomized |
| Madsen 2008 | Duplicate publication of Fredorak 2015 |
| Manship 2015 | Not clinical trial |
| Mercado 2009 | Population mice |
| Plein 1993 | Assesses diarrhea as a single clinical outcome |
| Sisson 2015 | Lacks appropriate outcome measure for CD |
| Yılmaz 2019 | No control group |