Supplement Scholar
Compound

Vitamin D3 + K2

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Vitamin D3 + K2. Synergistic combo for calcium routing.

How it works. D3 increases calcium absorption; K2 directs to bone not arteries.

What the research supports. 1 graded claims. Strongest: Better calcium handling (moderate).

How much to take. Typical dose: D3 2000 IU + K2 100 mcg.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Omega-3, CoQ10.

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Vitamin D3 + K2. Anecdotes are not medical advice.

Vitamin D3 + K2. Synergistic combo for calcium routing.

Key compound: cholecalciferolC27H44O · 384.6 g/mol

What it is

Synergistic combo for calcium routing.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

Goals

Bone HealthCardiovascular Health

How it works

D3 increases calcium absorption; K2 directs to bone not arteries.

Pathways

  • D3 increases calcium absorption
  • K2 directs to bone not arteries

Effects

  • +Better calcium handling supports

What the research supports

Better calcium handlingmoderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
D3 2000 IU + K2 100 mcg
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodWith a meal containing fat for fat-soluble compounds; otherwise either.
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • Bleeding with warfarin

Medication interactions

Prescription medications (general)minor

Always disclose Vitamin D3 + K2 use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

  • Omega-3Anti-inflammatory cardiovascular synergy.
  • CoQ10Supports mitochondrial energetics in cardiac tissue.

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

D3+K2 vs D3 alone ↗
Meta-analysis · Osteoporos Int · 2020

D3+K2 had additive bone density benefit.

PubMed: Vitamin D3 + K2 — Better calcium handling ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Vitamin D3 + K2 and "Better calcium handling". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Vitamin D3 + K2 — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Vitamin D3 + K2 and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

Discussion

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