Reduced Upper Respiratory Tract Infection Days
| Supplement | Research Paper | Effect Type | Effect Size |
|---|---|---|---|
| Bifidobacterium animalis subsp. lactis BB-12 | 10.1002/mnfr.201500665 | Beneficial | Moderate |
| Lactobacillus casei HA-108 | 10.1017/S0007114509991395 | Beneficial | Large |