L. rhamnosus GG (ATCC 53103)
Discovered in 1985, this is the most extensively studied probiotic strain globally, with over 1,000 scientific publications.
Clinical Evidence
L. rhamnosus GG (often branded as Culturelle) is a transient colonizer of the human gut. It is characterized by its strong pili (hair-like appendages) that allow it to adhere tightly to the intestinal mucosa.
Key Applications & Dosage
| Condition | Clinical Dosage | Evidence Grade |
|---|---|---|
| Antibiotic-Associated Diarrhea (Prevention) | 10-20 Billion CFU/day | Strong (WGO Guidelines) |
| Acute Pediatric Gastroenteritis | 10 Billion CFU/day | Strong |
| IBS (Pain reduction) | 10 Billion CFU/day | Moderate |
Mechanisms of Action
LGG works primarily through competitive exclusion (outcompeting pathogens for adhesion sites) and the enhancement of intestinal barrier function via upregulation of tight junction proteins.
FAQ
Does LGG permanently colonize the gut?
No. Like most probiotics, it is transient. It can be detected in stool while taking the supplement and for a few days to a week after cessation, but it does not take up permanent residence.