What do systematic reviews say?

Lactobacillus GG vs placebo

It is very uncertain whether lactobacillus GG changes clinical improvement compared with placebo (very low certainty).

• Treatment and prevention of pouchitis after ileal pouch‐anal anastomosis for chronic ulcerative colitis 2019 · Cochrane Headline outcomes only
  RR 3 [0.14, 65.9]
  1 study · 20 participants
  Very low