Surprising
A systematic review of 924 children found that Lactobacillus reuteri taken for at least three months was consistently linked to improved social behavior — but the evidence for other autism core symptoms remains too patchy to call.
This is one of the first broad looks at this specific probiotic for social symptoms in autism, so the finding is intriguing but far from settled — the review itself calls the overall evidence limited and heterogeneous.
Researchers pooled data from multiple studies on probiotics for children with autism and found that Lactobacillus reuteri, when taken for three months or longer, was repeatedly tied to better social and communication behavior. However, the same consistency did not hold for other core autism symptoms, and the studies varied so much in design that the authors urge caution before drawing firm conclusions.
Where this fits in the evidence
This is among the first studies we've indexed on Lactobacillus reuteri for Improved Social Behavior — treat it as an early signal until more research accumulates.
The study
Effects of Probiotic Supplementation on Core Symptoms of Autism Spectrum Disorder in Children.
- Systematic Review
- n = 924
- 2026-03-31
- Nutrients
- PubMed: 41978177
- DOI: 10.3390/nu18071127
- Full study breakdown →
This is a plain-language summary of a research finding, not medical advice. Pillser surfaces research signals to help you decide what's worth investigating — always consult a qualified professional before changing what you take.