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Bifidobacterium longum

What the research shows

No concerns

none of the findings here link it to harm

A rod-shaped bacterium found in the human gut.

It is often added to food products and its production of lactic acid is believed to prevent growth of pathogenic organisms.12

What research says

Studies in people

  • Benefit

    Gut bacteria and disease risk3

    Trials suggest Bifidobacterium longum may help prevent or ease some diseases, but more research is needed.

  • Open question

    Infant gut health4

    In infant studies, Bifidobacterium longum infantis may help build a healthy gut, but study limits make its true benefit unclear.

  • Benefit

    IBS symptom relief5

    In adults with IBS, 8 weeks of Bifidobacterium longum 35624 was linked to less bloating, gas, pain and diarrhea.

Animal and lab studies only

  • Benefit

    Memory and learning in aging6

    In animal studies, Bifidobacterium longum helped reverse memory and learning decline caused by a chemical.

The signal at the top counts the findings in people and in animal and lab studies. A concern in studies of people outranks animal and lab studies, and “No concerns” needs at least one finding in people. When most findings in people point one way, the page leans that way (“Mostly”), and every finding is still shown. Findings whose study type is not stated are shown but not counted. This page is a reference, not medical advice. It describes what regulators and published research say. Talk to a doctor or dietitian about your own diet.

Products

The 6 most-scanned of 62 products on Open Food Facts that list bifidobacterium longum.

  • COLLAGEN PEPTIDES orgain · cada cuánto se toma 0 additives
  • Complete gut chocolate Biomel 5 additives
  • Complete Gut Biomel · 450 g 3 additives
  • New Zealand Protein Schinoussa 1 additive
  • Probiotic chocolate Bouchard 1 additive
  • Whey Protein Lake Avenue · 5 lb 1 additive

References

  1. 1Bifidobacterium longum: ingredient taxonomy entry. Open Food Facts.
  2. 2Bifidobacterium longum. Wikipedia. Accessed September 30, 2026. CC BY-SA 4.0.
  3. 3Mills S, Yang B, Smith GJ, Stanton C, Ross RP. Efficacy of Bifidobacterium longum alone or in multi-strain probiotic formulations during early life and beyond. Gut Microbes. 2023;15(1):2186098. doi:10.1080/19490976.2023.2186098
  4. 4Dargenio VN, Cristofori F, Brindicci VF, et al. Impact of Bifidobacterium longum Subspecies infantis on Pediatric Gut Health and Nutrition: Current Evidence and Future Directions. Nutrients. 2024;16(20). doi:10.3390/nu16203510
  5. 5Lenoir M, Wienke J, Fardao-Beyler F, Roese N. An 8-Week Course of Bifidobacterium longum 35624(®) Is Associated with a Reduction in the Symptoms of Irritable Bowel Syndrome. Probiotics Antimicrob Proteins. 2025;17(1):315-327. doi:10.1007/s12602-023-10151-w
  6. 6Zhang X, Ma X, Zhang J, Nie H, Mu G, Wu X. Investigation of the Mitigating Mechanism of Bifidobacterium longum 300 in d-Galactose-Induced Cognitive Impairment in Mice. J Agric Food Chem. 2025;73(25):15661-15672. doi:10.1021/acs.jafc.5c01742