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 K
Selected research topic
Nutrient status
Some publications still need interpretation checks and are kept separate from the findings below.
- Publications for this topic
- 10
- Human comparison publications
- 0
- Publications needing review
- 10
This result is held for interpretation. That does not mean research found no effect.
Outcome groups needing additional review (8)
- MK4 · Distinct papers needing additional review: 1Direction unclear: 1
- MK4 deficiency · Distinct papers needing additional review: 1Evidence criteria check: 1
- MK7 · Distinct papers needing additional review: 1Direction unclear: 1
- plasma VK1 and MK-4 concentrations · Distinct papers needing additional review: 1Evidence criteria check: 1
- Vitamin K1 · Distinct papers needing additional review: 2Evidence criteria check: 2
- VK1 · Distinct papers needing additional review: 1Direction unclear: 1
- VK2 blood levels · Distinct papers needing additional review: 1Evidence criteria check: 1
- VKDB · Distinct papers needing additional review: 1Interpretation held: 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
Some findings are held for review
Some papers have not cleared source or result review, so their findings are not summarized yet.
No confirmed result is available to summarize with study conditions.
2 publications linked to this result (2 awaiting review included)
- Those papers are not summarized until review is complete.
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 31.6 evidence score includes 0 independent human studies and 0 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: 142
Papers linked to this topic 10 · distinct papers 10 · comparison findings need further review · papers needing additional review 10
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.
- MK4: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- MK4 deficiency: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- MK7: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- plasma VK1 and MK-4 concentrations: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- Vitamin K1: Sources represented in this measurement group: 2 · Distinct papers with human comparisons for this outcome: 0
- VK1: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- VK2 blood levels: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
- VKDB: Sources represented in this measurement group: 1 · Distinct papers with human comparisons for this outcome: 0
What the research found
MK4
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · General population
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.
MK4 deficiency
The study needs further checking before its result can be interpreted.
Observational study · 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.
MK7
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · General population
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.
plasma VK1 and MK-4 concentrations
The study needs further checking before its result can be interpreted.
Observational study · 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.
Unspecified measured outcome
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · Unspecified population
The comparison could not be confirmed.
Analysis coverage and paper counts
2 papers · 2 measured outcomes
2 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.
Other evidence · Unknown intervention · Unspecified population
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.
vitamin K1
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · Patient group
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.
Vitamin K1
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · Patient group
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.
VK1
The study needs further checking before its result can be interpreted.
Observational study · Unknown intervention · General population
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.
VK2 blood levels
The study needs further checking before its result can be interpreted.
Observational study · 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.
VKDB
The study needs further checking before its result can be interpreted.
Other evidence · Single ingredient · 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 combination cautions are available to show in the current data. This does not guarantee safety.
Side effects and combination studies
No side-effect or combination findings are available to show from the collected papers. This does not establish safety.