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Bifidobacterium longum

Probiotic, Bifidobacterium genus bacteria. Supplement in Russia and Spain; marketing segment of «psychobiotics» promising gut-brain axis effects. AEMPS does not register it as a medicine

ATC code: A07FA-BLONGUM

Brand names – supplements: Now Bifidobacterium Longum, Jarro-Dophilus EPS, Garden of Life Raw Probiotics, Renew Life Ultimate FloraSupplements are not tested in clinical trials and are not registered as medications.

Updated · Methodology

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Acne and PCOS with hyperandrogenism

Not recommended

Bifidobacterium longum is a probiotic strain added to supplements and marketed for acne and as support in polycystic ovary syndrome with hyperandrogenism. There is no convincing evidence that taking this strain improves acne or lowers androgen levels in PCOS. For acne, topical retinoids, benzoyl peroxide, azelaic acid, and systemic options where indicated have proven benefit; for PCOS with hyperandrogenism, doctor-selected hormonal therapy, metformin, and weight management help. The strain is harmless, but do not use it in place of treatment with proven benefit – that risks delaying the care you actually need.

Sources

  1. AGA: AGA clinical practice guidelines on the role of probiotics in the management of gastrointestinal disorders (2020)

ICD-10: L70.0 · ICD-11: ED80

D

Chronic fatigue

Not recommended

Bifidobacterium longum is a probiotic strain sold as an energy supplement and promoted for chronic fatigue. For this use the data fall short: there is no solid evidence base that the strain relieves chronic fatigue. When fatigue persists, what helps is finding the cause with a doctor (anemia, thyroid problems, sleep disorders, depression) and treating that. Don't use this supplement in place of a proper workup and a treatment with proven benefit

Sources

  1. ACG: ACG clinical guideline: management of irritable bowel syndrome (2021)

ICD-10: R53 · ICD-11: MG22

D

Immune support and respiratory infection care

Not recommended

Bifidobacterium longum is a probiotic bacterium added to supplements and marketed to strengthen immunity and prevent colds and flu. Convincing benefit for this use has not been shown: there is no evidence base confirming that taking this strain leads to fewer respiratory infections or makes them milder. For a cold, rest, plenty of fluids and treating symptoms help, and for the flu a doctor may prescribe antivirals when indicated. The bacterium is harmless in this role, but do not rely on it instead of treatment with proven benefit, since that can mean missing the care you actually need.

Sources

  1. AGA: AGA clinical practice guidelines on the role of probiotics in the management of gastrointestinal disorders (2020)
D

Irritable bowel syndrome

Not recommended

B. longum (especially B. longum NCC3001 in Pinto-Sanchez 2017 RCT) is offered for IBS with associated anxiety and depression. 2021 IBS guideline gives a conditional recommendation against routine probiotic use in adult IBS: effect is strain-specific, evidence low-quality. ESNM/UEG 2022 IBS consensus states that individual strains may show effect but no single recommended strain. In an IBS patient, first line is diet discussion (low-FODMAP), psyllium as soluble fibre, antispasmodics for IBS-D, rifaximin for IBS-D. If B. longum was recommended for IBS without discussing diet, psyllium and red flags, consider seeking a second opinion from a gastroenterologist.

Sources

  1. ACG: ACG clinical guideline: management of irritable bowel syndrome (2021)
  2. ESNM / UEG: United European Gastroenterology and European Society of Neurogastroenterology and Motility consensus on functional dyspepsia and IBS (2022)

ICD-10: K58.8 · ICD-11: DD91.0Z

How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Bifidobacterium longum is a Gram-positive anaerobe, natural inhabitant of the human large intestine, predominant in the gut microbiota of breastfed infants. It metabolises breast milk oligosaccharides and dietary fibres producing short-chain fatty acids (butyrate, acetate, propionate). In laboratory models it shows anti-inflammatory effects through IL-10 production and TNF-α reduction, competes with pathogens for mucosal receptors. The «psychobiotics» concept (Dinan and Cryan 2013) hypothesises gut-brain axis effects via vagus nerve, serotonergic signals and systemic inflammation. In humans, these mechanisms are not confirmed in RCTs with clinical endpoints. B. longum marketing for anxiety, depression and biohack formulas for «emotion control» outpaces the evidence base.

Safety

Contraindications

  • Immunodeficiency (AIDS-stage HIV, neutropenia, post-transplant) – bacteraemia risk
  • Central venous catheter – rare bacterial endocarditis cases
  • Critically ill patients in intensive care
  • Severe acute pancreatitis
  • Hypersensitivity to formulation components

Serious adverse effects

  • Bacteraemia and sepsis in immunocompromised patients (rare)
  • Masking of functional diagnoses (IBS, FD), delaying organic pathology diagnosis
  • Distracting patients from evidence-based methods (topical retinoids for acne, SSRIs and CBT for anxiety and depression) towards marketing «psychobiotics»

Common adverse effects

  • Abdominal bloating, flatulence (first 1–3 days)
  • Stool pattern change
  • Epigastric discomfort

Pregnancy: can you take Bifidobacterium longum?

In pregnancy, B. longum at fermented food doses is considered safe. RCTs with maternal and foetal endpoints are limited.

Breastfeeding: can you take Bifidobacterium longum?

Compatible with breastfeeding. Bifidobacteria are dominant in the breastfed infant gut microbiota and do not cross into milk via systemic circulation.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

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Frequently asked

What is Bifidobacterium longum used for?

Bifidobacterium longum is evaluated for the following indications with varying evidence strength: Irritable bowel syndrome (evidence tier D), Chronic fatigue (evidence tier D), Immune support and respiratory infection care (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Bifidobacterium longum?

Common side effects of Bifidobacterium longum (≥ 1 in 100): Abdominal bloating, flatulence (first 1–3 days), Stool pattern change, Epigastric discomfort. See the Safety section for uncommon and serious reactions.

Is Bifidobacterium longum safe during pregnancy?

In pregnancy, B. longum at fermented food doses is considered safe. RCTs with maternal and foetal endpoints are limited.

Is Bifidobacterium longum compatible with breastfeeding?

Compatible with breastfeeding. Bifidobacteria are dominant in the breastfed infant gut microbiota and do not cross into milk via systemic circulation.

Who should not take Bifidobacterium longum?

Bifidobacterium longum is contraindicated in: Immunodeficiency (AIDS-stage HIV, neutropenia, post-transplant) – bacteraemia risk; Central venous catheter – rare bacterial endocarditis cases; Critically ill patients in intensive care; Severe acute pancreatitis; Hypersensitivity to formulation components. Full list in the Safety section.

Other drugs in this group

Curcumin (Curcuma longa extract), Diosmectite, Lactobacillus rhamnosus GG (LGG), Loperamide, Nystatin, Saccharomyces boulardii CNCM I-745, Mesalazine, Nifuroxazide