Vitamin K2

Magnesium also supports proper calcium metabolism

Comprehensive mineral and calcium regulation support

⟡ Calcium

Vitamin K2 activates matrix Gla protein (MGP) and osteocalcin, directing calcium into bones and preventing arterial calcification from supplemental calcium.

Calcium gets deposited into bone rather than arterial walls, improving cardiovascular safety of calcium supplementation

⟡ Multivitamin

MVIs typically contain vitamin K1; K2 (MK-7) has distinct roles in directing calcium to bones rather than arteries. Combining both forms ensures comprehensive vitamin K activity.

Enhanced bone mineral density and cardiovascular protection via optimized calcium metabolism

Top studies from 39+ peer-reviewed papers

📊rctn=151

Atieh O et al. • Nutrients (2025)

“Vitamins K2/D3 improved the RECOVER Long COVID Index, the number of LC symptoms, and several gut and inflammatory markers.”

Key Findings:

The median age was 46 years; 71% were female and 29% were non-white.
In the vitamin K2/D3 arm, there was a 7.1% decrease in the proportion who had an LC Index ≥12 (vs. a 7.2% increase in the SOC group; p = 0.01).
The average number of LC symptoms remained stable in the vitamin K2/D3 arm but increased in the SOC arm (p = 0.03).

📚meta-analysisn=2570

Zhang Z et al. • Frontiers in endocrinology (2025)

“Vitamin K2 supplementation improves key bone turnover biomarkers, particularly OC and ucOC.”

Key Findings:

Vitamin K2 (VK2) increased osteocalcin (OC; MD 1.86, 95% CI 1.17-2.56) and bone-specific alkaline phosphatase (BAP; MD 1.49, 95% CI 0.98-2.00).
It reduced undercarboxylated OC (ucOC; WMD -1.54, 95% CI -2.44 to -0.64) and tartrate-resistant acid phosphatase (TRAP; MD -0.83, 95% CI -1.21 to -0.46).
C-terminal telopeptide (CTX) showed a small, statistically significant reduction (MD -0.09, 95% CI -0.14 to -0.05) with uncertain clinical relevance.

📊rctn=310

Tan J et al. • JAMA internal medicine (2024)

“This randomized clinical trial showed that vitamin K2 supplementation significantly reduced the frequency, intensity, and duration of NLCs in an older population with good safety.”

Key Findings:

Of the 199 enrolled individuals, 108 (54.3%) were female, and the mean (SD) age was 72.3 (5.5) years.
A total of 103 patients (51.8%) were randomly assigned to receive vitamin K2 and 96 (48.2%) were assigned to placebo.
The between-group difference was statistically significant (difference, -2.67; 95% CI, -2.86 to -2.49; P < .001).

📚meta-analysis

Zhao QY et al. • Journal of nutritional science (2024)

“We demonstrated that supplementation with vitamin K has no effect on anthropometrics indexes, CRP, glucose metabolism, and lipid profile factors except HOMA-IR.© The Author(s) 2024.”

Key Findings:

Pooled weighted mean difference (WMD) and 95 % confidence intervals (95 % CI) were achieved by random-model effect analysis for the best estimation of outcomes.
The pooled findings showed that vitamin K supplementation can reduce homeostatic model assessment insulin resistance (HOMA-IR) (WMD: -0⋅24, 95 % CI: -0⋅49, -0⋅02, P = 0⋅047) significantly compared to the placebo group.
Subgroup analysis showed a significant effect of vitamin K2 supplementation compared to vitamin K1 supplementation on HOMA-IR.
However, no significant effect was observed on other variables.

📚meta-analysisn=6425

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Ma ML et al. • Frontiers in public health (2022)

“The results of this meta-analysis seem to indicate that VK2 supplementation has a positive effect on the maintenance and improvement of BMD LS in postmenopausal women, and it can also reduce the fracture incidence, serum uc-OC levels and the ratio of uc-OC to cOC.”

Key Findings:

The overall effect test of 10 studies showed a significant improvement in lumbar spine BMD (BMD LS) (P = 0.006) with VK2.
The subgroup analysis of VK2 combination therapy showed that BMD LS was significantly maintained and improved with the administration of VK2 (P = 0.03).
The overall effect test of the six RCTs showed no significant difference in fracture incidence between the two groups (RR=0.96, P=0.65).
However, after excluding one heterogeneous study, the overall effect test showed a significant reduction in fracture incidence with VK2 (RR = 0.43, P = 0.01).

View all 39+ studies

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Vitamin K2

vitamin

Vitamin K2 (Menaquinone)

Fat-soluble vitamin that directs calcium to bones instead of arteries, supporting cardiovascular and bone health.

longevitybone healthcardiovascularcalciumvitamin D cofactor

39+ studies

Evidence

Reviewed 19 days ago

moderate

Safety

100-200mcg (MK-7)

Dose

12- weeks

Time to Effect

MK-7 (menaquinone-7)

Best Form

Mechanisms of Action

🦴

Osteocalcin Activation

Activates the protein that binds calcium to bones

❤️

Arterial Protection

Keeps calcium out of blood vessels

Biological PathwayBeta

How Vitamin K2 works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.

Supplement

Molecular Target

Biological Process

Health Outcome

Strong

Moderate

Emerging

strong

moderate

emerging

Tap node to isolate • Pinch to zoom • Tap edge for research

Recommended Dose

100-200mcg (MK-7)

45mcg300mcg

Optimal Timing

With a meal containing fat

Take with food

Available Forms

Form	Type
💊MK-7 (menaquinone-7)	Recommended
💊MK-4 (requires higher doses, multiple times daily)	Alternative

MK-7 has longer half-life (72 hours vs 6 hours for MK-4) and is effective at lower doses.

Duration

Minimum: 12 weeks

Optimal: weeks

Cycling: Not required

Note: Fat-soluble, so take with food containing fat for absorption. Often paired with vitamin D3.

🦴

Improved Bone Health

Supports bone density when combined with D3 and calcium

📅 6-12 months

70% of users notice thispositive

❤️

Cardiovascular Support

May reduce arterial calcification over time

📅 1-3 years

60% of users notice thispositive

ModerateMax safe dose: No established upper limit; doses up to 1000mcg used safely

🟢

Pregnant/nursing

Likely safe at recommended doses; supports fetal bone development

🔴

Those on blood thinners

Who Should NOT Take This

Those taking warfarin or other vitamin K antagonists (consult doctor)
Anticoagulant or blood thinner therapy (warfarin, heparin, Coumadin) — Vitamin K2 directly antagonizes warfarin's mechanism of action

Drug Interactions

Warfarin / Anticoagulants (Coumadin, heparin)severe

Other anticoagulantsmoderate

Consult doctor before combining

Possible Side Effects

None commonly reported

mildrare

Tip: N/A

Warnings

Critical interaction with warfarin and vitamin K antagonists
Benefits are long-term — don't expect quick results

✦ Vitamin D3

enhances

D3 increases calcium absorption; K2 directs it properly

Essential pairing for bone health and preventing soft tissue calcification

⟡ Magnesium

Magnesium also supports proper calcium metabolism

Comprehensive mineral and calcium regulation support

⟡ Calcium

Vitamin K2 activates matrix Gla protein (MGP) and osteocalcin, directing calcium into bones and preventing arterial calcification from supplemental calcium.

Calcium gets deposited into bone rather than arterial walls, improving cardiovascular safety of calcium supplementation

⟡ Multivitamin

MVIs typically contain vitamin K1; K2 (MK-7) has distinct roles in directing calcium to bones rather than arteries. Combining both forms ensures comprehensive vitamin K activity.

Enhanced bone mineral density and cardiovascular protection via optimized calcium metabolism

Top studies from 39+ peer-reviewed papers

📊rctn=151

Atieh O et al. • Nutrients (2025)

“Vitamins K2/D3 improved the RECOVER Long COVID Index, the number of LC symptoms, and several gut and inflammatory markers.”

Key Findings:

The median age was 46 years; 71% were female and 29% were non-white.
In the vitamin K2/D3 arm, there was a 7.1% decrease in the proportion who had an LC Index ≥12 (vs. a 7.2% increase in the SOC group; p = 0.01).
The average number of LC symptoms remained stable in the vitamin K2/D3 arm but increased in the SOC arm (p = 0.03).

📚meta-analysisn=2570

Zhang Z et al. • Frontiers in endocrinology (2025)

“Vitamin K2 supplementation improves key bone turnover biomarkers, particularly OC and ucOC.”

Key Findings:

Vitamin K2 (VK2) increased osteocalcin (OC; MD 1.86, 95% CI 1.17-2.56) and bone-specific alkaline phosphatase (BAP; MD 1.49, 95% CI 0.98-2.00).
It reduced undercarboxylated OC (ucOC; WMD -1.54, 95% CI -2.44 to -0.64) and tartrate-resistant acid phosphatase (TRAP; MD -0.83, 95% CI -1.21 to -0.46).
C-terminal telopeptide (CTX) showed a small, statistically significant reduction (MD -0.09, 95% CI -0.14 to -0.05) with uncertain clinical relevance.

📊rctn=310

Tan J et al. • JAMA internal medicine (2024)

“This randomized clinical trial showed that vitamin K2 supplementation significantly reduced the frequency, intensity, and duration of NLCs in an older population with good safety.”

Key Findings:

Of the 199 enrolled individuals, 108 (54.3%) were female, and the mean (SD) age was 72.3 (5.5) years.
A total of 103 patients (51.8%) were randomly assigned to receive vitamin K2 and 96 (48.2%) were assigned to placebo.
The between-group difference was statistically significant (difference, -2.67; 95% CI, -2.86 to -2.49; P < .001).

📚meta-analysis

Zhao QY et al. • Journal of nutritional science (2024)

“We demonstrated that supplementation with vitamin K has no effect on anthropometrics indexes, CRP, glucose metabolism, and lipid profile factors except HOMA-IR.© The Author(s) 2024.”

Key Findings:

Pooled weighted mean difference (WMD) and 95 % confidence intervals (95 % CI) were achieved by random-model effect analysis for the best estimation of outcomes.
The pooled findings showed that vitamin K supplementation can reduce homeostatic model assessment insulin resistance (HOMA-IR) (WMD: -0⋅24, 95 % CI: -0⋅49, -0⋅02, P = 0⋅047) significantly compared to the placebo group.
Subgroup analysis showed a significant effect of vitamin K2 supplementation compared to vitamin K1 supplementation on HOMA-IR.
However, no significant effect was observed on other variables.

📚meta-analysisn=6425

Compare with Others Find Based on Your Goals

Ma ML et al. • Frontiers in public health (2022)

“The results of this meta-analysis seem to indicate that VK2 supplementation has a positive effect on the maintenance and improvement of BMD LS in postmenopausal women, and it can also reduce the fracture incidence, serum uc-OC levels and the ratio of uc-OC to cOC.”

Key Findings:

The overall effect test of 10 studies showed a significant improvement in lumbar spine BMD (BMD LS) (P = 0.006) with VK2.
The subgroup analysis of VK2 combination therapy showed that BMD LS was significantly maintained and improved with the administration of VK2 (P = 0.03).
The overall effect test of the six RCTs showed no significant difference in fracture incidence between the two groups (RR=0.96, P=0.65).
However, after excluding one heterogeneous study, the overall effect test showed a significant reduction in fracture incidence with VK2 (RR = 0.43, P = 0.01).

View all 39+ studies

What would you like to do next?

Related Supplements

Bs8.5

Beta-Sitosterol

Plant sterol that reduces BPH urinary symptoms in clinical trials and blocks intestinal cholesterol absorption.

Vd9.0

Vitamin D3

Hormone-like vitamin that regulates 1,000+ genes — deficiency is widespread and linked to poor immunity, depression, and bone loss.

E9.0

Vitamin E

Lipid-soluble antioxidant that shields cell membranes from oxidative damage — natural mixed tocopherols preferred over synthetic forms.

Vc8.5

Vitamin C