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Head-to-head evidence comparison — which supplement is right for you?
L. rhamnosus GG vs Lactoferrin: Lactoferrin has the stronger overall evidence (6.3 vs 6/10); they're alternatives for support immune system — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Lactoferrin wins 2 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
1 of 1 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both L. rhamnosus GG and Lactoferrin 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
200–300 mg daily for adults; 100–200 mg/day for children (a typical label dose, not the dose used in the cited trials, which used 600 to 3,400 mg a day in adults, and no cited trial states a dose for children)
30–60 minutes before breakfast, Between meals on an empty stomach
Bovine lactoferrin capsule or powder (≥95% purity)
During the antibiotic course
During hospital stay
n/a
n/a
4–8 weeks of use
4–8 weeks
4–8 weeks
6–12 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)
Effect of Lactoferrin Supplementation on Inflammation, Immune Function, and Prevention of Respiratory Tract Infections in Humans: A Systematic Review and Meta-analysis.
Advances in Nutrition (2022) · Meta analysis
Lactoferrin significantly reduced IL-6 in adults (mean difference: -24.9 pg/mL; 95% CI: -41.64, -8.08 pg/mL)
Lactoferrin reduces the risk of respiratory tract infections: A meta-analysis of randomized controlled trials.
Clinical Nutrition ESPEN (2021) · Meta analysis · n=1194
Pooled analysis of RCTs showed significant reduction in respiratory tract infection risk with lactoferrin supplementation
Comparative Effects between Oral Lactoferrin and Ferrous Sulfate Supplementation on Iron-Deficiency Anemia: A Comprehensive Review and Meta-Analysis of Clinical Trials.
Nutrients (2022) · Meta analysis
Lactoferrin supplementation had better effects on serum iron (WMD: 41.44 ug/dL; p < 0.00001), ferritin (WMD: 13.60 ng/mL; p = 0.003) and hemoglobin concentration (11.80 g/dL; p < 0.00001), but a reducing effect on fractional iron absorption (WMD: −2.08%; p = 0.02) and IL-6 levels (WMD: −45.59 pg/mL; p < 0.00001) compared with ferrous sulfate.
Lactoferrin has a higher evidence score (6.3/10 vs 6/10) and wins in 2 of 3 categories.
For support immune system, Lactoferrin has a higher relevance score (92 vs 38).
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.