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Molecular Pathways and Clinical Applications of Probiotics as Effective Supporters of Intestinal, Neurologic, and Cardiovascular Health: a Narrative Review.

  • 2026-11
  • The Journal of nutritional biochemistry 157
    • Álvaro Vergara A Nieto
    • Andrés Halabi Diaz
    • Millaray Hernández Millán
    • Daniel Sagredo
    • Javier Arriagada Gacitua

Study Design

Type
Review

Purpose of review

This narrative review aims to synthesize current knowledge on the molecular mechanisms and clinical applications of probiotics across three major health domains: intestinal, neurologic, and cardiovascular.

Recent findings

•Intestinal health: Probiotics such as Lactobacillus rhamnosus GG and Bifidobacterium lactis BB-12 reinforce epithelial integrity via upregulation of tight-junction proteins (occludin, claudin-1), attenuate inflammation through cytokine modulation (↑IL-10, ↓TNF-α, IL-6), and restore eubiosis in conditions including IBS, constipation, and antibiotic-associated diarrhea. • Neurologic health: "Psychobiotic" strains (e.g., L. rhamnosus JB-1, B. longum 1714, L. helveticus R0052 + B. longum R0175) modulate neurotransmitter synthesis (GABA, serotonin), dampen HPA-axis hyperactivity, and reduce neuroinflammation, yielding improvements in anxiety, stress resilience, cognitive function, and slowing brain-atrophy progression in MCI and Alzheimer's disease. • Cardiovascular health: Meta-analyses of 30+ RCTs demonstrate that probiotic supplementation (notably L. acidophilus, L. plantarum, B. longum) lowers total and LDL cholesterol (-7 to -10 mg/dL) via bile-salt hydrolase activity, SCFA-mediated GPR signaling, direct cholesterol assimilation, and modestly reduces systolic (-2 to -4 mmHg) and diastolic blood pressure through anti-inflammatory pathways and improved endothelial function. • Safety: While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

Summary

Probiotics exert strain-specific, multi-mechanistic benefits on gut barrier integrity, neuroendocrine signaling, and cardiometabolic regulation. To fully realize their therapeutic promise, future research must pursue large-scale, head-to-head clinical trials, integrate multi-omics and precision-design approaches, and establish standardized frameworks for safety monitoring and personalized formulation.

Research Insights

Adverse Events Reported

  • Lactobacillus rhamnosus GG→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • Lactobacillus acidophilus→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • Lactobacillus helveticus R0052→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • Bifidobacterium lactis BB-12→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • Bifidobacterium longum R0175→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • Lactobacillus plantarum→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
  • bifidobacterium longum→Overall tolerability

    While generally safe in healthy populations, rare adverse events (bacteremia, D-lactic acidosis, horizontal gene transfer) have been reported in immunocompromised or critically ill individuals, underscoring the need for individualized risk-benefit assessments and rigorous adverse-event surveillance.

    Finding
    Reported
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