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Evidence found and GRADE certainty

124 questions · 125 findings · 11 reviews

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No studies found 23 · 18.4%GRADE not reported 4 · 3.2%Very low 56 · 44.8%Low 38 · 30.4%Moderate 4 · 3.2%High 0 · 0%

Immune‐enhancing supplements (oral or enteral) vs usual care or control

Infectious complications · people undergoing gastrointestinal surgery

Immune‐enhancing supplements (oral or enteral) showed no clear difference in infectious complications recorded up to 30 days postdischarge compared with usual care or control (low certainty).

1 finding from 1 review

Immune‐enhancing supplements (oral or enteral) vs usual care or control

Non‐infectious complications · people undergoing gastrointestinal surgery

Immune‐enhancing supplements (oral or enteral) showed no clear difference in non‐ infectious complications recorded up to 30 days postdischarge compared with usual care or control (low certainty).

1 finding from 1 review