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 B6
Selected research topic
Nutrient status
The confirmed comparison studies tested several ingredients together. They cannot isolate the effect of this ingredient.
Some findings concern patients or people with a deficiency.
- Publications for this topic
- 7
- Human comparison publications
- 1
- Publications needing review
- 4
Findings in the studies
tHcy
- Results were mixed for this outcome.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · first year and 5-year follow-upMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Results were compared between groups. · Study comparison: B-vitamin-containing randomized arms across MTHFR TT, CT and CC genotypes
- Additional measurement information
- Biomarker
- Measurement time
- first year and 5-year follow-up
homocysteine
Other human research, including observational studies and reviews
- A change was reported, but the comparison could not be confirmed.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
Patient group · Combination study · variedMeasurement and study conditions
- Study type
- Meta-analysis
- Study population
- Human participants · Patient group
- Ingredients tested
- Ingredient combination
- How results were compared
- Study comparison: Combined B6+B9+B12 supplementation versus placebo/control trial arms; no B6-only estimate reported
- Additional measurement information
- Biomarker
- Measurement time
- varied
serum levels of each B vitamin
Other human research, including observational studies and reviews
- A change was reported before and after use. Its cause cannot be isolated.
Several ingredients were tested together, so this ingredient’s individual effect is unknown.
General population · Combination study · baseline to six weeksMeasurement and study conditions
- Study type
- Randomized controlled trial: subjects were randomly assigned to groups for comparison.
- Study population
- Human participants · General population
- Ingredients tested
- Ingredient combination
- How results were compared
- Changes within the same group were compared. · Within-group comparison
- Additional measurement information
- Biomarker
- Measurement time
- baseline to six weeks
This result is held for interpretation. That does not mean research found no effect.
Outcome groups needing additional review (1)
- homocysteine concentrations · Distinct papers needing additional review: 1Evidence criteria check: 1
One paper can appear under multiple measured outcomes or review reasons, so these counts should not be added together.
Representative outcome and study details
Human studies reported a change with no confirmed comparison group in homocysteine.
combination-ingredient studies · Individual ingredient effects cannot be separated · Human studies · Includes patient groups · 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.
- Combination, formula, or class studies do not isolate this ingredient or establish synergy.
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: C
The 14.9 evidence score includes 1 independent human studies and 1 clinical studies in the representative benefit area. The C tier remains conservative because of limited repetition across independent human clinical studies, too few clinical findings with an explicit effect direction.
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: 90
Papers linked to this topic 7 · distinct papers 7 · papers with a confirmed human comparison 1 · papers needing additional review 4
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.
- homocysteine: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- homocysteine concentrations: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- serum levels of each B vitamin: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- tHcy: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 1
What the research found
tHcy
Results for this measurement were mixed; no consistent conclusion can be drawn.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
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.
serum levels of each B vitamin
A change was reported before and after use. Its cause cannot be isolated.
Controlled study in people · Ingredient combination · General population
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Within-group comparison
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.
homocysteine
A change was reported, but the comparison could not be confirmed.
Meta-analysis · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Analysis coverage and paper counts
1 paper · 1 measured outcome
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
homocysteine concentrations
The study needs further checking before its result can be interpreted.
Controlled study in people · Ingredient combination · Patient group
Several ingredients were used together. This does not establish the effect of this ingredient alone or synergy.
Between-group comparison
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Cell study · indirect · Unknown intervention · Unspecified 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
1 papers held from direction counts
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Meta-analysis · Unknown intervention · Patient group
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
Review overlap with primary papers is unknown; counts stay separate.
Direction counts are distinct papers within each row. Outcome contributions count endpoint results, so one paper may contribute more than once.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Other evidence · Unknown intervention · Patient group
The comparison could not be confirmed.
Analysis coverage and paper counts
1 paper · 1 measured outcome
1 papers held from direction counts
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.
Review 1 combination findings and 0 findings that outperformed an ingredient alone.
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.
IsoniazidInteractions with medications like isoniazid are mentioned as a cause of Vitamin B6 deficiency.
AntiepilepticsInteractions with certain antiepileptics are mentioned as a cause of Vitamin B6 deficiency.
Reported improvements with combinations
Combination findings are grouped by how the study compared them. This is not a recommendation to combine ingredients.
Combinations with reported improvement
The combination showed improvement, but each ingredient's contribution is unclear.
마그네슘In subjects with severe/extremely severe stress, the combination of magnesium and vitamin B6 resulted in a 24% greater improvement compared to magnesium alone (p=0.0203).