Overview
A synbiotic is a combination of a probiotic (live beneficial microorganism) and a prebiotic (substrate that selectively feeds beneficial microbes), designed to work synergistically — the prebiotic supports the survival and colonization of the probiotic organism. Synbiotics represent a more ecologically sophisticated intervention than either component alone (Karen's Brain Primitive 5: two-sided ecological engineering).
The ISAPP 2019 definition distinguishes:
- Complementary synbiotic: Probiotic + prebiotic chosen independently for their individual benefits.
- Synergistic synbiotic: Prebiotic specifically selected to enhance survival/function of the co-administered probiotic.
Clinical Evidence
- ASD: Synbiotic improved GI symptoms, behavior, and anxiety; restored dialister abundance mitchell 2024 synbiotics gdh gi behavior anxiety asd.
- Schizophrenia: Synbiotic improved metabolic syndrome parameters in schizophrenia RCT basafa roodi 2024 synbiotic metabolic syndrome schizophrenia rct.
- Hypothyroidism: Synbiotic improved thyroid function alongside levothyroxine ramezani 2023 synbiotic hypothyroidism rct.
- Breast cancer: Synbiotic during chemotherapy supported immune function khazaei 2023 synbiotics chemotherapy breast cancer rct.
- Crohn's disease: Synbiotic (B. longum + inulin-FOS) improved clinical and histological outcomes in RCT steed 2010 synbiotic crohns rct.
- Pancreatic cancer: Perioperative synbiotic improved immunomodulation post-resection maher 2024 synbiotics immunomodulation pdac resection.
Cross-References
- prebiotics — the prebiotic component
- probiotics general — the probiotic component
- dietary fiber — common prebiotic substrates
- faecalibacterium prausnitzii — target organism for synergistic synbiotic design