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Head-to-head evidence comparison — which supplement is right for you?
B. lactis (BB-12 / HN019) vs Inulin: Inulin has the stronger overall evidence (6 vs 6/10); they work on different things and are often used together, not either/or. Take the 60-second quiz for a pick tailored to your goals.
Inulin wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
13 of 14 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both B. lactis (BB-12 / HN019) and Inulin have evidence — compare verdict strength side-by-side.
1-10 billion CFU daily for BB-12 (1 billion is enough); 10-20 billion CFU daily for HN019 if transit is the goal
any
Capsule or sachet standardized to a named strain (BB-12 or HN019)
5-15g daily
With meals or in beverages, Can be taken any time of day, Divide into multiple doses if taking higher amounts
Chicory root inulin powder
Combined prebiotic and probiotic support for regularity — though combination trials cannot isolate the strain's own contribution.
A reasonable pairing for transit time. Introduce the fibre gradually to limit gas and bloating.
2 weeks
4 weeks
n/a
n/a
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
Dose-response effect of Bifidobacterium lactis HN019 on whole gut transit time and functional gastrointestinal symptoms in adults.
Scand J Gastroenterol (2011) · Rct · n=100
Whole-gut transit fell 49 to 21 hours on high dose (p<0.001) and 60 to 41 hours on low dose (p=0.01); placebo unchanged
Eight-Week Supplementation With Bifidobacterium lactis HN019 and Functional Constipation: A Randomized Clinical Trial.
JAMA Netw Open (2024) · Rct · n=229
Primary outcome (change in complete spontaneous bowel movements per week): +0.80 with HN019 vs +0.66 placebo — no difference
Effects of 28-day Bifidobacterium animalis subsp. lactis HN019 supplementation on colonic transit time and gastrointestinal symptoms in adults with functional constipation: A double-blind, randomized, placebo-controlled, and dose-ranging trial.
Gut Microbes (2018) · Rct · n=228
No significant differences vs placebo in the primary outcome (colonic transit time) or any secondary outcome
The effects of inulin-type fructans on cardiovascular disease risk factors: systematic review and meta-analysis of randomized controlled trials
The American journal of clinical nutrition (2024) · Meta analysis · n=2518
ITF may reduce low-density lipoprotein, triglycerides, and body weight.
The effects of chicory inulin-type fructans supplementation on weight management outcomes: systematic review, meta-analysis, and meta-regression of randomized controlled trials
The American journal of clinical nutrition (2024) · Meta analysis · n=1184
Chicory ITF significantly reduced body weight [mean difference (MD): -0.97 kg; 95% CI: -1.34, -0.59); n = 1184] compared with placebo.
Galactomannans are the most effective soluble dietary fibers in type 2 diabetes: a systematic review and network meta-analysis
The American journal of clinical nutrition (2023) · Meta analysis · n=2685
Galactomannans had the highest effect on reducing the levels of HbA1c (SUCRA: 92.33%) and fasting blood glucose (SUCRA: 85.92%).
Meta-analysis showed modest weight loss of -0.97 kg but with considerable heterogeneity (I2: 73%). Combined fiber study showed larger effect but included other fibers alongside inulin.
AI-estimated from published studies. Interpret as directional guidance.
Inulin has a higher evidence score (6/10 vs 6/10) and wins in 1 of 3 categories.
For improve digestion, Inulin has a higher relevance score (85 vs 68).
B. lactis (BB-12 / HN019) and Inulin may work well together: Combined prebiotic and probiotic support for regularity — though combination trials cannot isolate the strain's own contribution. A reasonable pairing for transit time. Introduce the fibre gradually to limit gas and bloating.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.