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Lactobacillus rhamnosus GG

Gut · IBS · Pediatric diarrhoea

Tier 1 — Strong Evidence

What it is

The most studied probiotic strain in the world, with decades of clinical research. The 2020 Cochrane review (Collinson, previously Allen) concluded probiotics including LGG probably shorten acute infectious diarrhoea in children by around 1 day. Separate systematic reviews also support LGG for preventing antibiotic-associated diarrhoea and modest benefit for some IBS symptoms. Very safe even in infants. Refrigerated strains maintain better viability.

Efficacy

4/5

Safety

5/5

Research

4/5

Onset

3/5

Cost

3/5

Drug-int.

4/5

Dose

10–20 billion CFU/day; refrigerated strains preferred for viability

Time of day & tips

Take on an empty stomach or 30 min before a meal for best survival. Avoid taking with hot drinks — heat kills live cultures. Keep refrigerated.

Sensitive populations: This supplement's evidence base touches pregnancy, pediatric, or other sensitive populations. Confirm any change with your healthcare provider before use.

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