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Lhe3.0
L. helveticus R0052 + B. longum R0175 Research
Mostly mechanism / observational
9 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most L. helveticus R0052 + B. longum R0175 studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 2008–2025 with a typical study size of 78 participants.
Based on 9 studies · 5 RCTs · 359 total participants
Confidence
Moderate confidence
By outcome
Mood & depressionA meaningful drop in depression scores over 8 weeks in people with diagnosed major depressive disorder; no effect demonstrated in people who are not depressed · 4-8 weeks
Mostly mechanism / observational6 studies
Anxiety & stress responseNot established — the one independent trial in healthy adults found no effect on anxiety, and the founding psychotropic trial's HADS-anxiety result did not reach significance · 4 weeks
Mostly mechanism / observational5 studies
Stress-related GI symptoms
Mostly mechanism / observational3 studies
BDNF & neurochemical biomarkers
Mostly mechanism / observational3 studies
Safety profile
Too few graded studies2 studies
Active research area
4 studies in the last 5 years
200820162025
1RCTn=135 · medium study2023
In plain English: The only independent, non-industry trial of this combination found no significant effect on any pre-specified outcome in healthy adults.
Morales-Torres R et al. · Nutrients (2023)
NULL on the whole sample: 'no significant effects of probiotic intake in whole sample outcomes'
Pre-specified outcomes covered wellbeing, quality of life, emotional regulation, anxiety, mindfulness and interoceptive awareness — none moved
The only positive result was a POST HOC linear mixed-effects interaction between high Healthy Behaviors scores and probiotic intake, predicting effects on anxiety, emotional regulation and mindfulness
In plain English: The prescription of prebiotics and probiotics with the lifestyle measures seems interesting for the management of obesity especially if it is sarcopenic, in addition to the improvement of metabolic parameters and obesity-related psychiatric disorders.
Ben Othman R et al. · Endocrinology, diabetes & metabolism (2023)
All three groups showed a significant decrease in weight, BMI and waist circumference with p < .05.
Only the prebiotic and probiotic group showed a significant decrease in fat mass (p = .001) and a significant increase in muscle strength with p = .008 and .004, but the differences were not significant between the three groups.
Our results showed also a significant decrease in insulinemia and HOMA-IR in the prebiotic group compared to the diet-alone group (p = .03; p = .012) and the probiotic group showed a significant decrease in fasting blood glucose compared to the diet alone group (p = .02).
In plain English: The one clearly positive trial: depression scores nearly halved on the combination in patients with diagnosed MDD, at p=0.042.
Kazemi A et al. · Clin Nutr (2019)
BDI score fell 17.39 to 9.1 on the probiotic vs 18.18 to 15.55 on placebo and 19.72 to 14.14 on prebiotic (p=0.042)
110 patients with major depressive disorder randomised, but only 81 completed — roughly 26% attrition (28 probiotic, 27 prebiotic, 26 placebo)
Kynurenine/tryptophan ratio showed NO significant between-group difference in the primary comparison; it only reached significance versus placebo after adjusting for serum isoleucine (p=0.048)
In plain English: The founding Probio'Stick trial: significant relief of abdominal pain and nausea, and explicitly no effect on psychological symptoms or sleep.
Diop L, Guillou S, Durand H · Nutr Res (2008)
Significantly reduced two stress-induced gastrointestinal symptoms — abdominal pain and nausea/vomiting — in both intention-to-treat and per-protocol populations
EXPLICIT NULL on everything else: the probiotic 'did not significantly modify the other physical and psychological symptoms and sleep problems' induced by stressful life events
In plain English: The paper that made this combination famous — and it reports no sample size, no effect sizes, and no confidence intervals for the human arm.
Messaoudi M et al. · Br J Nutr (2011)
The abstract states NO sample size, NO effect sizes and NO confidence intervals for the human trial
Roughly seven findings reported at p<0.05 across multiple instruments (HSCL-90 global severity, somatisation, depression, anger-hostility; HADS global; CCL problem-solving; 24h urinary free cortisol) with no correction for multiplicity
HADS-anxiety was reported at P<0.06 — that is, NOT statistically significant, despite the anxiolytic framing
In plain English: Negative on gastrointestinal symptoms — though with only 5 participants in the active arm, it proves very little either way.
Wiącek J et al. · Int J Mol Sci (2025)
NO improvement in gastrointestinal symptoms on the Rome IV questionnaire
Faecal metabolome shifted in the probiotic group (permutation test p=0.026), including a reduction in (2RS)-2-(4-hydroxyphenyl)propionic acid (p=0.023)
Of 51 volunteers, 26 female dancers were randomised and only 16 were analysed — probiotic n=5, placebo n=11