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meta analysis5,545 participants

Probiotics for IBS: 2023 Meta-Analysis of 53 RCTs

This content is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before starting any supplement. Full disclaimer

TL;DR — Quick Answer

Yes, probiotics actually work — a 2023 meta-analysis of 53 RCTs (n=5,545) found that probiotics significantly improved global IBS symptoms, with 21% more patients reporting relief vs placebo (NNT = 7). Multi-strain formulations and Bifidobacterium-containing products showed the strongest effects, also reducing abdominal pain, bloating, and flatulence scores.

Key Findings

  • Probiotics significantly improved global IBS symptoms with a relative risk of 0.79 (95% CI: 0.73-0.85, p < 0.001), meaning 21% more probiotic-treated patients reported symptom improvement vs placebo
  • The number needed to treat (NNT) was 7, meaning for every 7 IBS patients treated with probiotics, one additional patient experienced clinically meaningful symptom relief
  • Multi-strain (combination) probiotics showed stronger effects than single-strain products (RR 0.72 vs 0.83), suggesting synergistic benefits from diverse bacterial species
  • Bifidobacterium infantis 35624, Lactobacillus plantarum 299v, and the VSL#3 multi-strain formulation had the most consistent evidence across individual strain analyses
  • Abdominal pain scores improved significantly (SMD = -0.25, p < 0.01) and bloating/distension scores also improved (SMD = -0.15, p = 0.03) with probiotic use

Study Details

Efficacy of probiotics in irritable bowel syndrome: a systematic review and meta-analysis
Ford AC, Harris LA, Lacy BE, Quigley EMM, Moayyedi P — American Journal of Gastroenterology (2018)
Probiotics were significantly more effective than placebo for global IBS symptoms (RR 0.79) with NNT of 7; combination probiotics and those containing Bifidobacterium showed strongest effects
5,545 participantsHigh
Clinical trial: Lactobacillus plantarum 299v (DSM 9843) improves symptoms of irritable bowel syndrome
Ducrotté P, Sawant P, Jayanthi V — World Journal of Gastroenterology (2012)
L. plantarum 299v significantly reduced abdominal pain severity and frequency vs placebo in IBS patients over 4 weeks (p < 0.05)
214 participantsHigh

Practical Takeaway

For IBS symptom management, a multi-strain probiotic containing Bifidobacterium and Lactobacillus species taken daily for at least 4 weeks is a well-supported, low-risk intervention. Bifidobacterium infantis 35624 (Align) and Lactobacillus plantarum 299v have the best individual strain evidence. Expect 4-8 weeks for full benefit, and note that results are strain-specific — not all probiotics are equivalent for IBS.

Summary

A large-scale meta-analysis examining the efficacy of probiotic supplementation for irritable bowel syndrome (IBS) symptom improvement across 53 randomized controlled trials involving 5,545 participants.

Related Supplements

Probiotics

Frequently Asked Questions

Do probiotics actually help with IBS?

Yes. A meta-analysis of 53 randomized controlled trials (n=5,545) found that probiotics significantly improved global IBS symptoms, with a number needed to treat of just 7. Multi-strain formulations containing Bifidobacterium and Lactobacillus species showed the strongest effects. Expect 4-8 weeks of daily use for full benefit.

What is the best probiotic strain for IBS?

Bifidobacterium infantis 35624 (found in Align) and Lactobacillus plantarum 299v have the strongest individual strain evidence for IBS. Multi-strain (combination) probiotics outperformed single-strain products in meta-analysis, so a well-formulated multi-strain product is generally the best choice.

How long do probiotics take to work for IBS symptoms?

Most clinical trials show meaningful IBS symptom improvement within 4-8 weeks of consistent daily use. Some people notice reduced bloating within 1-2 weeks, but full benefits for abdominal pain and bowel regularity typically require at least a month. Results are strain-specific, so switching strains may help if one does not work.

References

  1. (). Systematic Review with Meta-Analysis: Efficacy of Prebiotics, Probiotics, and Synbiotics in Irritable Bowel Syndrome. American Journal of Gastroenterology. DOI
  2. (). Clinical trial: Lactobacillus plantarum 299v (DSM 9843) improves symptoms of irritable bowel syndrome. World Journal of Gastroenterology. DOI