Conclusion: Adverse effects associated with probiotic and prebiotic use do not pose any serious health concerns to mother or infant. Our findings and knowledge translation visualisations provide healthcare professionals and consumers with information to make evidence-informed decisions about the use of pre- and probiotics.
PubMed 34371892 ↗L. Reuteri
People mainly take L. Reuteri for longevity, sleep, digestion. Based on 10 first-hand reports and 45 meta-analyses & systematic reviews in the medical literature. Ranked #1068 of 3,539 overall.
Of reports that state an outcome, 75% are positive.
What L. Reuteri does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: In therapeutic settings, L. reuteri administration reduces the duration of diarrhoea and increases the chance of cure. In preventive settings, L. reuteri has the potential to reduce the risk of community-acquired diarrhoea in otherwise healthy children.
PubMed 26991503 ↗Conclusion: The most validated treatments for infantile colics are the substitution of cows' milk by a hydrolysed formula, the use of L. reuteri and of fennel extracts.
PubMed 22365343 ↗Conclusion: Supplementation with the probiotic L. reuteri in breastfed infants appears to be safe and effective for the management of infantile colic. Further research is needed to determine the role of probiotics in infants who are formula-fed.
PubMed 26940647 ↗Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
“L. Reuteri did that to me. Deep rem sleep. Waking up with no bloating, feeling leaner and refreshed.”
“I am LOVING l reuteri spp. and a branded probiotic I don't think i can say; new and it ups dopamine but it's expensive.”
“I've just started L.Reuteri tablets to raise Oxytocin level which seems to be having a good effect”
Top discussions (5)
Other options for longevity
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate