Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

45 questions · 45 findings · 7 reviews · Gut

No studies found 11 · 24.4%GRADE not reported 4 · 8.9%Very low 18 · 40%Low 10 · 22.2%Moderate 2 · 4.4%High 0 · 0%

High‐treatment‐dose vitamin D (greater than 1000 IU/day) vs low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day)

Withdrawals due to adverse events · people with inflammatory bowel disease

It is very uncertain whether high‐treatment‐dose vitamin D (greater than 1000 IU/day) changes withdrawals due to adverse events compared with low‐treatment‐dose vitamin D (400 IU/day to 1000 IU/day) (very low certainty).

1 finding from 1 review

Any‐treatment‐dose vitamin D (greater than 400 IU/day) vs supplemental‐dose vitamin D (less than 400 IU/day)

Withdrawals due to adverse events · people with inflammatory bowel disease

It is very uncertain whether any‐treatment‐dose vitamin D (greater than 400 IU/day) changes withdrawals due to adverse events compared with supplemental‐dose vitamin D (less than 400 IU/day) (very low certainty).

1 finding from 1 review

Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Adverse events up to week 10 · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in adverse events up to week 10 compared with placebo and two infusions of infliximab (moderate certainty).

1 finding from 1 review

Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Serious adverse events up to week 10 · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in serious adverse events up to week 10 compared with placebo and two infusions of infliximab (low certainty).

1 finding from 1 review

Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Withdrawals due to adverse outcomes · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in withdrawal due to adverse events up to week 10 compared with placebo and two infusions of infliximab (low certainty).

1 finding from 1 review