Improvement after a supplement is not the same as a comparative result
Start with the comparison. A before-and-after change alone cannot isolate the contribution of an ingredient.
Vitamin B12
Selected research topic
Digestion and gut health
The available findings are indirect evidence from animal or cell research. They do not establish the same effects in people.
- Publications for this topic
- 1
- Human comparison publications
- 0
- Publications needing review
- 0
Findings in the studies
gut barrier tight junctions
Animal and cell research · indirect evidence
- A change was reported in animal or cell research.Single ingredient
Measurement and study conditions
- Study type
- Controlled trial
- Study population
- This is animal research. The specific characteristics of the subjects need further review.
- Ingredients tested
- Single ingredient
- How results were compared
- Comparison unclear · Study comparison: B12 addition in fish gut; exact comparator and protocol details unspecified
- Additional measurement information
- Mechanistic outcome
- Measurement time
- Not confirmed.
Representative outcome and study details
Animal studies reported improvement in gut barrier tight junctions.
Single-ingredient studies · Animal studies; human applicability unconfirmed · comparator not confirmed
1 publications linked to this result
- Route, form, dose, or population details are incomplete, so the findings cannot be confirmed as directly comparable.
- Animal and cell findings are indirect evidence.
Data coverage and detailed study classifications
Paper counts are separated by research topic below. One paper may contribute to multiple findings.
Analysis status: Public-ready
Ingredient analysis date:
How the grade was determined: B
The 57.4 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The B tier remains conservative because of the evidence centers on contextual or measured outcomes rather than general-use effects, limited repetition across independent human clinical studies.
The grade is based mainly on the research area with the most evidence. It does not mean the same result was found in other areas.
Papers linked to this ingredient overall: 96
Papers linked to this topic 1 · distinct papers 1 · comparison findings need further review · papers needing additional review 0
A publication may appear in more than one count. These numbers should not be added. Ingredient-wide papers, topic-linked papers, and sources in outcome groups use different scopes. Adding source counts may count the same paper more than once.
- gut barrier tight junctions: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
gut barrier tight junctions
A change was reported in animal or cell research.
Animal study · indirect · Single ingredient · General population
This finding comes from animal or cell research. It does not establish the same effect in people.
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
How to read research findings
How should I read research findings?
Research guidesNo clear difference and an uninterpretable result are different
A reported null comparison contains a result. An abstract without an interpretable comparison leaves a question unresolved.
Paper counts and study counts are different
Count original research separately from research that reanalyzes it. Publication volume is neither replication nor a quality rating.
Side effects and combination findings
Findings from this ingredient alone are shown separately from those involving another supplement or medication.
No reviewed caution rules are available yet. Reported caution findings are shown below.
Findings to review with care
Side effects reported for the ingredient alone are separated from findings involving another supplement or medication.
Cautions reported with another supplement or medication
These studies reported worsening outcomes, reduced absorption, or other cautions with combined use. They do not predict an individual's outcome.
AntacidsAntacids may alter vitamin B12 absorption and utilization, increasing deficiency risk.
MetforminMetformin-treated T2DM patients are at higher risk of vitamin B12 deficiency and more severe neuropathy symptoms; supplementation may prevent or treat these conditions.
Proton pump inhibitorsPPI use may impact the absorption of vitamin B12, resulting in a slightly increased risk of deficiency.