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Head-to-head evidence comparison — which supplement is right for you?
B. lactis (BB-12 / HN019) vs Lactase: B. lactis (BB-12 / HN019) has the stronger overall evidence (6 vs 5.5/10); 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.
B. lactis (BB-12 / HN019) wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (1)
Outcomes where both B. lactis (BB-12 / HN019) and Lactase 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 time of day
Capsule or sachet standardized to a named strain (BB-12 or HN019)
Taken per lactose-containing meal, not as a daily dose. Trials gave 3,000 to 11,250 units of lactase (mostly FCC units) immediately before or with a single dairy or lactose challenge. One 2022 trial used 4,662 FCC units and describes 4,500 FCC units as the amount in the EU-approved health claim. More lactose needs more enzyme: 50 g of lactose given in water overwhelmed about 6,000 units in one trial. Products differ, so dose by the enzyme units on the label rather than by tablet count.
With meals
Lactase tablets, capsules or chewables labelled in FCC units, taken with dairy
2 weeks
4 weeks
n/a
n/a
Hours (same meal)
Hours (same meal)
Hours (same meal)
Hours (same meal)
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
Systematic review: effective management strategies for lactose intolerance.
Annals of Internal Medicine (2010) · Systematic review
36 randomised trials met the inclusion criteria, 26 of them on lactase- or lactose-hydrolysed milk supplements, lactose-reduced milk, or tolerable doses of lactose.
Effect of lactase supplementation on infant colic: Systematic review of randomized controlled trials.
Journal of Pediatric Gastroenterology and Nutrition (2024) · Meta analysis · n=391
Five randomised trials with 391 infants under 6 months old with colic were included.
The effect of oral supplementation with Lactobacillus reuteri or tilactase in lactose intolerant patients: randomized trial.
European Review for Medical and Pharmacological Sciences (2010) · Rct · n=60
60 lactose-intolerant patients were randomised to tilactase taken 15 minutes before a lactose breath test, placebo, or Lactobacillus reuteri twice daily for 10 days beforehand (20 per group).
B. lactis (BB-12 / HN019) has a higher evidence score (6/10 vs 5.5/10) and wins in 2 of 3 categories.
For improve digestion, B. lactis (BB-12 / HN019) has a higher relevance score (68 vs 45).
No known interactions between B. lactis (BB-12 / HN019) and Lactase have been documented in our database. However, always consult a healthcare provider before combining supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.