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← Conditions Mental health Genus-level

ADHD

Compared within 3 studies that had both: 44 people with ADHD and 106 healthy people. No genera less common in people with ADHD, and 1 more common.

A difference is an association: it doesn’t mean these genera cause, prevent or treat ADHD. GMrepo reports this group at the genus level only, so these are genera, not species.

Searching opens both lists and shows only matching rows.

Less common in ADHD · 0

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people

None compared.

More common in ADHD · 1

Strongest first, then the biggest gap · Each figure is 10 people Strongest first · Each figure is 10 people
  1. Oscillibacter genus in 3 studies Healthy 19% ADHD 48%

Where these numbers come from

Studies
Only GMrepo projects that had people with the condition and healthy people, 10 or more of each. Numbers come from those studies, never from pooling.Sampled in China, the Netherlands, the United States.
How common
The share of people whose sample has any of it, in the people with the condition and in the healthy people of those same studies. Tested within studies (Cochran–Mantel–Haenszel, corrected for testing many microbes); a difference counts when it is clear and meaningful (Cohen’s h of 0.2 or more).
Strength word
Counted by code from how many studies point the same way: Seen again and again (3 or more, none clearly the other way), Seen more than once (2, the majority), Seen once (1, listed last). Where studies disagree, a row isn’t listed.
Each study
Tap a row for every study’s own numbers, and for how much carriers have.
Analysis
Our analysis of GMrepo data. GMrepo on Data sources · Read the rules

Also compared · 74 genera

Compared within studies that had both, but not listed above.

No meaningful difference · 74
PubMed · human studies and reviews first

Recent research

All research on it
  1. Randomized trial Neuropsychopharmacology reports · 2026
    Probiotic Supplementation and Executive Function in Children With Attention-Deficit/Hyperactivity Disorder.
    PubMed ↗
  2. Randomized trial BMC psychiatry · 2025
    Effects of kefir on symptoms, sleep, and gut microbiota in children with ADHD: a randomised controlled trial.
    PubMed ↗
  3. Systematic review Journal of psychiatric research · 2025
    A systematic review on the associations between Attention-Deficit/Hyperactivity Disorder and gut microbiome.
    PubMed ↗
  4. Clinical trial Molecular nutrition & food research · 2025
    Efficacy and Safety of a Probiotic Mixture Containing Bifidobacterium animalis subsp. lactis BLa80 and Lacticaseibacillus rhamnosus LRa05 in Children With Attention-Deficit/Hyperactivity Disorder.
    PubMed ↗
  5. Randomized trial Nutritional neuroscience · 2024
    Effect of probiotics as an adjunctive therapy with Ritalin among ADHD children and adolescents: a triple-blind randomized controlled trial.
    PubMed ↗

Source: PubMed, U.S. National Library of Medicine · 16 linked papers, last 10 years