Bifidobacterium lactis HN019

Also known as: B. lactis HN019, Bifidobacterium animalis subsp. lactis HN019, HOWARU Bifido

Evidence under review. — Not yet rated

Common probiotic strain. Limited evidence for constipation relief; may help with immunity when combined with other strains.

What it does

Bifidobacterium lactis HN019 is a probiotic bacterium commonly added to supplements and infant formulas. It has been studied for its potential to improve bowel regularity, support immune function,...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose based on provided studies

See full breakdown ↓ Methodology →

What the Science Says

Bifidobacterium lactis HN019 is a probiotic bacterium commonly added to supplements and infant formulas. It has been studied for its potential to improve bowel regularity, support immune function, and reduce inflammation, though most evidence comes from multi-strain products rather than HN019 alone. When used as part of a probiotic blend, it may help shorten fever duration in children with respiratory infections and improve some cardiovascular markers in hypertensive women.

What It Doesn't Do

Won't reliably relieve constipation — two large, well-designed clinical trials found it performed no better than placebo. Not proven to improve bowel movement frequency on its own. Don't expect it to replace laxatives or treat chronic digestive conditions. No evidence it causes meaningful weight loss or improves body composition.

Evidence-Based Benefits

A probiotic blend including HN019 reduced fever duration by 2 days in children with respiratory infections.

Weak Evidence

Effective at: 0.5 mL daily multi-strain blend for 14 days

Supporting studies (click to view on PubMed):

PMID 40085083

A multi-strain probiotic blend containing HN019 improved fasting glucose, cholesterol, and HDL in hypertensive women.

Weak Evidence

Effective at: 10⁹ CFU/day per strain in a 4-strain blend for 8 weeks

Supporting studies (click to view on PubMed):

PMID 32756643

Absorption & Bioavailability

Unknown — probiotic survival through the gut is strain-dependent and not directly measured in the provided studies

Red Flags to Watch For

Two large randomized controlled trials (229 and multi-center French trial) found HN019 did NOT outperform placebo for constipation relief — a primary marketing claim for this strain
Most positive findings come from multi-strain probiotic blends, making it impossible to attribute benefits to HN019 alone
Widely added to infant formula in China despite acknowledged insufficient scientific evidence on feeding effects
Dose used in studies varied widely and no optimal dose has been established

Frequently Asked Questions

What does Bifidobacterium lactis HN019 do?

Common probiotic strain. Limited evidence for constipation relief; may help with immunity when combined with other strains.

What is the effective dose of Bifidobacterium lactis HN019?

No established dose based on provided studies

Is Bifidobacterium lactis HN019 safe?

Two large randomized controlled trials (229 and multi-center French trial) found HN019 did NOT outperform placebo for constipation relief — a primary marketing claim for this strain

What doesn't Bifidobacterium lactis HN019 do?

Won't reliably relieve constipation — two large, well-designed clinical trials found it performed no better than placebo.

Research Sources

PubMed
NIH DSLD

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25