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Head-to-head evidence comparison — which supplement is right for you?
L. rhamnosus GG vs PHGG: L. rhamnosus GG has the stronger overall evidence (6 vs 6/10); they're alternatives for improve digestion — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
L. rhamnosus GG wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (1)
Outcomes where both L. rhamnosus GG and PHGG have evidence — compare verdict strength side-by-side.
10-20 billion CFU (1-2 x 10^10) daily. A meta-analysis in children with acute gastroenteritis found LGG effective at 10 billion CFU/day or more, and borderline below that.
Any time of day
Capsule standardized to ATCC 53103
5-6g daily
With meals, Can be added to drinks or food
PHGG powder (Sunfiber is common brand)
During the antibiotic course
During hospital stay
n/a
n/a
1-2 weeks
2-4 weeks
2-4 weeks
Lactobacillus rhamnosus GG versus Placebo for Acute Gastroenteritis in Children.
N Engl J Med (2018) · Rct · n=971
Primary outcome (modified Vesikari score >=9 within 14 days): 11.8% with LGG vs 12.6% placebo; RR 0.96 (0.68-1.35), P=0.83
Systematic review with meta-analysis: Lactobacillus rhamnosus GG in the prevention of antibiotic-associated diarrhoea in children and adults.
Aliment Pharmacol Ther (2015) · Meta analysis
Antibiotic-associated diarrhea fell from 22.4% to 12.3%; RR 0.49 (0.29-0.83) pooled across 11 RCTs, n=1,308 (12 RCTs, n=1,499 included overall)
Probiotics for treating acute infectious diarrhoea.
Cochrane Database Syst Rev (2020) · Meta analysis
In studies at low risk of bias, no difference in diarrhea lasting >=48 hours (RR 1.00, 0.91-1.09; moderate certainty)
Effectiveness of Partially Hydrolyzed Guar Gum on Cognitive Function and Sleep Efficiency in Healthy Elderly Subjects in a Randomized, Double-Blind, Placebo-Controlled, and Parallel-Group Study
Nutrients (2024) · Rct
The visual memory scores in cognitive function tests and sleepiness on rising scores related to sleep quality were significantly improved in the PHGG group compared to the placebo group.
Continuous partially hydrolyzed guar gum intake reduces cold-like symptoms: a randomized, placebo-controlled, double-blinded trial in healthy adults
European review for medical and pharmacological sciences (2022) · Rct · n=96
Double-blind RCT in 96 healthy Japanese adults given 5.2 g PHGG or placebo daily for 12 weeks.
Prebiotic Effects of Partially Hydrolyzed Guar Gum on the Composition and Function of the Human Microbiota-Results from the PAGODA Trial
Nutrients (2020) · Open label · n=20
To gain functional insight, we further studied stool metabolites using nuclear magnetic resonance (NMR) spectroscopy. (3) Results: In healthy subjects, PHGG had significant effects on stool frequency and consistency.
Both points come from one multicentre open trial in IBS patients that gave 5 g a day (46 patients) or 10 g a day (40 patients) for 12 weeks (PMID 15986863). Symptoms and quality of life improved from baseline in both groups, with no better result reported at 10 g, and the gain faded by the 6-month follow-up. The trial had no placebo group, so the size of the effect over placebo is unknown. Lower and higher doses were not tested, so no optimal dose or safety ceiling can be read from it.
AI-estimated from published studies. Interpret as directional guidance.
L. rhamnosus GG has a higher evidence score (6/10 vs 6/10) and wins in 1 of 3 categories.
For improve digestion, PHGG has a higher relevance score (87 vs 72).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.