Studies

The strongest supplied evidence concerns zinc for childhood diarrhea. Pooled clinical research supports shorter episodes of acute or persistent diarrhea when zinc is added to usual care, including oral rehydration. Preventive supplementation can also modestly reduce diarrhea occurrence, with most research conducted in settings where inadequate nutrition and zinc deficiency are common.

The benefit is not universal. Several trials find little or no effect, including research in very young infants and populations where deficiency is uncommon. Results also vary with the preparation and treatment setting, and improvements in illness duration do not consistently extend to every measure of severity. Supplementation increases vomiting in pooled research, which is a meaningful limitation during diarrheal illness.

Evidence for other digestive uses is more preliminary. Zinc carnosine has shown potential to protect intestinal-barrier function during exposure to an anti-inflammatory medicine, but that specific compound and setting cannot establish broad benefits from zinc alone. The available research does not demonstrate routine improvement in digestion for well-nourished adults.

130 linked studies · 26 sampled for detail · Sep 27, 2026