Overview
Synergistic combo for calcium routing.
- Endogenously produced or biosynthesized molecule
- Standardized pharmaceutical- or food-grade supplement
- Combined with cofactors that improve absorption or activity
- Capsule or softgel
- Powder
- Sublingual or buccal
- Liposomal liquid
Mechanism of action
D3 increases calcium absorption; K2 directs to bone not arteries.
- · D3 increases calcium absorption
- · K2 directs to bone not arteries
Effects on the body
Organ system effects
Vitamin D3 + K2 contributes to bone mineralization, osteoblast activity, or calcium-phosphate homeostasis.
Vitamin D3 + K2 supports endothelial function, lipid profile, or blood-pressure regulation in cardiovascular trials.
Evidence-based benefits
Better calcium handling
Moderate evidencePotential side effects
- · Bleeding with warfarin
Drug interactions
Supplement interactions
- Omega-3Anti-inflammatory cardiovascular synergy.
- CoQ10Supports mitochondrial energetics in cardiac tissue.
No specific avoidances listed.
Dosing & bioavailability
Where to buy
Affiliate links — we may earn a commission at no extra cost to you. Amazon code supplementsch-20 is auto-applied at checkout. We don't endorse specific brands; verify third-party testing (USP, NSF, Informed Sport) before purchase.
Third-party testedIndependently verified Vitamin D3 + K2 — look for USP, NSF, or Informed Sport seals on the label for purity and dose accuracy.Vitamin D3 + K2 third party tested NSF
CapsulesPre-measured Vitamin D3 + K2 capsules — easiest for travel and consistent daily dosing without scoops or scales.Vitamin D3 + K2 capsules
PowderBulk unflavored Vitamin D3 + K2 powder — best cost-per-gram and flexible dosing for stacking or mixing into drinks.Vitamin D3 + K2 powder unflavored
Best sellersMost-purchased Vitamin D3 + K2 products on Amazon — a quick way to see what's reviewed widely before you commit.Vitamin D3 + K2 best sellerScientific evidence8Show studiesHide studies
D3+K2 vs D3 alone
Kuang X, et al.
7 trials
D3+K2 had additive bone density benefit.
PubMed: Vitamin D3 + K2 — Better calcium handling
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PubMed: Vitamin D3 + K2 — randomized controlled trial
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PubMed: Vitamin D3 + K2 — dose response
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Google Scholar: Vitamin D3 + K2 — clinical evidence
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