Related Herbs
Botanicals connected by the same goals, effects, or research topics.
Compound Profile
Vitamin D3 + K2
Vitamin D3 + K2 combines vitamin D repletion with vitamin K dependent calcium protein activation; sleep evidence is deficiency dependent and mixed.
Use extra caution — Safety evidence: excessive vitamin D3 can cause hypercalcemia or hypercalciuria, while vitamin K can alter vitamin K antagonist anticoagulation. Details
Last reviewed: Report a correctionProfile-wide ·Unassigned
At a glance
From this profile's structured data- Evidence
- Editorial grade not demonstrated by recorded studies
- Safety
- Safety evidence: excessive vitamin D3 can cause hypercalcemia or hypercalciuria, while vitamin K can alter vitamin-K-antagonist anticoagulation.
- Profile context
- VDR, osteocalcin, matrix Gla protein
Quick stats
- Evidence level
- Needs review
- Typical onset
- Varies by prep
- Safety rating
- Use extra caution: Interaction risk
- Best for
- VDR, Osteocalcin, Matrix Gla Protein
- Avoid / review if
- Hypercalcemia Or Vitamin D Toxicity
Safety
Safety & Cautions
Elevated caution
Caution level: Elevated. One caution category applies — read it before use.
- Anticoagulant CautionBleeding or anticoagulant-adjacent caution language is present.
- Safety evidence
- excessive vitamin D3 can cause hypercalcemia or hypercalciuria, while vitamin K can alter vitamin-K-antagonist anticoagulation
- Who should avoid this?
- Hypercalcemia Or Vitamin D Toxicity
- Talk to a professional if
- you use relevant medications, you are pregnant or breastfeeding, you have a condition named in this safety summary.
Exact D3 and K2 doses matter; warfarin use, kidney or calcium disorders, pregnancy, and high-dose use require clinician review.
Evidence-based safety
Caution when combined
Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.
High-Priority Caution
147 flagged pairingsBleeding / anticoagulant risk
High-Priority Caution
147 flagged pairingsBleeding / anticoagulant risk
Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.
Bleeding / anticoagulant riskCertainty: Theoretical
Data provenance recorded for 147 of 147 pairings in this mechanism group.
- aescin — Theoretical interaction certainty
- Aged Garlic Extract — Theoretical interaction certainty
- ajoene — Theoretical interaction certainty
- Ajwain — Theoretical interaction certainty
- Allicin — Theoretical interaction certainty
- Garlic — Theoretical interaction certainty
- American Ginseng Extract — Theoretical interaction certainty
- Andrographis — Theoretical interaction certainty
- Angelica Archangelica — Theoretical interaction certainty
- Angelica Dahurica — Theoretical interaction certainty
- Angelica Pubescens — Theoretical interaction certainty
- Angelica Root — Theoretical interaction certainty
+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.
Evidence Summary
Profile-wide ·UnassignedEvidence lens
Treat this profile as unresolved until source review is complete.
Needs reviewNeeds review
Human clinical evidence: Not the primary signal
Mechanistic / preclinical: Mechanism mapped — Immune Signaling Modulation · Neurotransmitter Modulation · Calcium Homeostasis Regulation
Research maturity: Theoretical / mechanistic research — Mechanistic or unresolved evidence is kept separate from established human outcomes.
Safety boundary: Safety note available — Safety evidence: excessive vitamin D3 can cause hypercalcemia or hypercalciuria, while vitamin K can alter vitamin K antagonist anticoagulation.
Evidence Strength
Confidence estimate based on the design quality and consistency of published clinical trials.
Vitamin D3 + K2 has an evidence rating that is still under review.
Sleep SupportSleep
Effects
3
How evidence grades work
Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.
- Strong
- Multiple RCTs, consistent direction, adequate effect size
- Moderate
- Some RCTs or consistent observational data in humans
- Preliminary / Mixed
- Animal or in-vitro only, or conflicting human data
- Traditional / Theoretical
- Traditional use only; no controlled human trials
How Vitamin D3 + K2 Works
Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.
Mechanism Pathway — How Vitamin D3 + K2 Works
CompoundTarget / ReceptorMechanismEffect / Outcome
Dosing
- Common form
- capsule or softgel
- No standardized dose
- Our source data records the usual product form for this ingredient but no studied dose. Preparations differ widely, so follow the standardization on the product you actually have and speak to a clinician before starting.
Mechanisms & biological pathways
Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.
- Immune Signaling Modulation
- Neurotransmitter Modulation
- Calcium Homeostasis Regulation
- Gamma Carboxylation / Matrix Protein Activation
- Inflammatory Signaling Modulation
- Vitamin D Receptor Activation
Guides that use Vitamin D3 + K2
Condition guides
Continue exploring
Related research paths
Related Compounds
Compounds connected by the same goals, effects, or research topics.
Related Guides
Deeper context, comparisons, and practical research paths.
Related Safety Pages
Safety checks and cautions relevant to this decision.
Related Articles
Deeper context, comparisons, and practical research paths.
Compare & Sourcing
Compare side-by-side tradeoffs or verify active marker guidelines.
Related alternatives
Herbs for similar conditions
Tradeoffs
Free safety checklist
Get the Vitamin D3 + K2 evidence notes
Occasional research updates, safety context, and product-quality checks for supplement decisions.
We use your email to send the checklist and occasional evidence-first supplement updates. Unsubscribe anytime. Privacy policy.
Safety first · Harm reduction
This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.
Learn how we evaluate confidence, safety, and intensity on the methodology page.
Editorial Review
Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.
Help improve this profile
Was this useful for your research?
These controls record only the page and the structured choice you make when analytics consent is enabled. Please don’t include personal medical information in research requests.
Was this evidence summary clear?
Did you find what you were researching?