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Lactobacillus helveticus Rosell-52

What does the research say about Lactobacillus helveticus Rosell-52?

3 health outcomes synthesised

Research on Lactobacillus helveticus Rosell-52 has explored its effects across 3 health outcomes, with the strongest evidence in reduced depression symptoms (4 studies). A 2025 meta-analysis of 7 RCTs reported a moderate-sized reduction in depressive symptoms, though most data come from multi-strain interventions, making the specific contribution of this single strain difficult to isolate. No consistent effective dose has been established across studies, and populations studied include adults with depression and adults with cancer.

Strongest evidence The most researched outcome for Lactobacillus helveticus Rosell-52 is reduced depression symptoms, supported by 4 studies including a 2025 meta-analysis of 7 RCTs. The meta-analysis reported a moderate-sized effect (SMD -0.55, p=0.03), though the evidence strength is rated low due to a small evidence base, high heterogeneity (I²=79%), and potential publication bias. All studies were beneficial but most used multi-strain probiotics, limiting attribution to this single strain alone.

Mixed or weaker evidence Improved cognitive function and improved mental health are supported by low and very low evidence, respectively. For cognitive function, 3 studies reported benefit, with one meta-analysis showing a large effect (SMD=-0.90, p=0.01), but effect sizes varied from small to large across studies. The evidence for improved mental health is the weakest — all 3 studies were narrative reviews without original data, and none provided statistical significance for this specific supplement–outcome pair.

Effective dose patterns No consistent effective dose was reported across any of the syntheses. Effective dose is listed as null for all three outcomes, meaning no reliable dose range emerged from the available research.

Population insights Research largely focuses on adults with depression, with one study also including adults with cancer. For cognitive function, the meta-analysis was limited to patients with depression, and applicability to healthy populations remains unclear.

Notable caveats

  • All three syntheses caution that the evidence base is small (3–4 studies each) and conclusions are preliminary.
  • Publication bias is a concern across all areas — null results are less likely to be published.
  • Most data come from multi-strain probiotic interventions, making it impossible to fully isolate the effects of Lactobacillus helveticus Rosell-52 alone.
  • The highest-quality study for depression showed high heterogeneity (I²=79%), indicating inconsistent effects across trials.

Frequently asked

  • What is Lactobacillus helveticus Rosell-52 good for according to research?
    Research has explored three health outcomes: reduced depression symptoms, improved cognitive function, and improved mental health. The strongest evidence is for reduced depression symptoms, where 4 studies (including a 2025 meta-analysis) reported beneficial effects, though the evidence strength is rated low. All studies for cognitive function and mental health also report benefit, but the evidence is weaker and comes primarily from reviews rather than direct trials of this specific strain.
  • What dose of Lactobacillus helveticus Rosell-52 is typically used in studies?
    No consistent effective dose has been reported across the research syntheses. The available studies did not allow extraction of a reliable dose range, and none of the three outcomes had an effective dose specified. This is likely because most studies used multi-strain probiotic formulations, varying doses, and different study durations.
  • Who benefits most from Lactobacillus helveticus Rosell-52?
    The research has primarily studied adults with depression, including some with cancer. For cognitive function, the strongest data come from the same meta-analysis in patients with depression. Whether healthy populations benefit is unclear, as applicability beyond these groups has not been established.
  • Does Lactobacillus helveticus Rosell-52 help with depression symptoms?
    Yes, but the evidence is preliminary. Across 4 studies, all reported benefit, and a 2025 meta-analysis of 7 RCTs found a moderate-sized reduction in depressive symptoms (SMD -0.55). However, most studies used multi-strain probiotics, so the specific contribution of this single strain is not fully isolated, and the evidence strength is rated low with high heterogeneity (I²=79%).
  • How strong is the evidence for cognitive benefits from Lactobacillus helveticus Rosell-52?
    The evidence is low in strength and comes from only 3 studies. One meta-analysis reported a large significant effect (SMD=-0.90), but effect sizes across studies ranged from small to large. The meta-analysis was limited to patients with depression, and publication bias is a concern. No original trials isolating this strain for cognitive function were reported.
  • Are there caveats or limitations in the research on Lactobacillus helveticus Rosell-52?
    Yes, multiple caveats apply across all outcomes. The evidence base is small (3–4 studies per outcome), and many conclusions come from reviews or multi-strain interventions rather than direct single-strain trials. Publication bias is a concern — null results are less likely to be published. For depression, the meta-analysis showed high heterogeneity, meaning effects varied considerably between studies.

Most-studied combinations with Lactobacillus helveticus Rosell-52

most supplement research is combination research
Also studied with:Bifidobacterium bifidum Rosell-71 (5), Bifidobacterium breve Rosell-70 (4), Bifidobacterium longum Rosell-175 (6), Lactobacillus plantarum Rosell-A (4), Bifidobacterium breve Bb-18 (2), Bifidobacterium plantarum (2)

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