10 Best Vitamin K2 Supplements (2026) Reviewed
Vitamin K2 remains one of the most underrated nutrients in the supplement world. While vitamin D and calcium get most of the attention for bone health, research increasingly suggests that K2 may be the missing piece that helps direct calcium where it belongs—into bones and teeth—while keeping it out of arteries and soft tissues where it can cause problems.
Unlike vitamin K1, which is abundant in leafy greens, vitamin K2 is harder to obtain through diet alone. It’s found primarily in fermented foods like natto (a Japanese dish many Westerners find challenging to eat regularly), certain cheeses, and organ meats. For most people, supplementation offers the most practical way to maintain adequate K2 levels.
To compile this guide, we researched dozens of vitamin K2 supplements, cross-referencing Amazon bestseller data, ConsumerLab testing results, and recommendations from nutritionists and healthcare practitioners. We evaluated products based on form (MK-7, MK-4, or full-spectrum), dosage, third-party testing, ingredient quality, and overall value.
Table of Contents
- Quick Comparison Table
- MK-7 vs. MK-4: Which Form is Best?
- Individual Product Reviews
- Buying Guide
- How to Take Vitamin K2
- Potential Benefits
- Safety Considerations
- FAQ
- Bottom Line
Quick Comparison Table
| Product | Form | Serving Size | Key Differentiator | Best For | Winner |
|---|---|---|---|---|---|
| Life Extension Super K | K1 + MK-4 + MK-7 | 1 softgel | Comprehensive full-spectrum formula | Overall bone & heart support | 🏆 TOP PICK |
| Thorne Vitamin K | K1 + MK-4 + MK-7 | 1 capsule | Practitioner-trusted brand, high-dose MK-4 | Clinical-grade quality | 🥇 Best Premium |
| InnovixLabs Full Spectrum K2 | MK-4 + MK-7 | 1 softgel | ConsumerLab Top Pick, trans-form MK-7 | Verified quality seekers | 🥇 Best Value |
| Doctor’s Best Natural K2 MK-7 | MK-7 (MenaQ7) | 1 capsule | Patented MenaQ7 ingredient | Standalone MK-7 | |
| NOW Foods MK-7 K2 | MK-7 (MenaQ7) | 1 capsule | Budget-friendly from trusted brand | Budget buyers | 🥇 Best Budget |
| Sports Research D3+K2 | D3 + MK-7 | 1 softgel | Vegan, Non-GMO verified, plant-based | Vegan D3+K2 combo | 🥇 Best Vegan |
| Solgar Vitamin K2 MK-7 | MK-7 (from natto) | 1 capsule | Whole food sourced, 75+ year brand | Natural-source preference | |
| Healthy Origins K2 MK-7 | MK-7 | 1 softgel | Organic olive oil base, natto-derived | Clean ingredient seekers | |
| Nutricost Vitamin K2 MK-7 | MK-7 | 1 softgel | 240-count supply, excellent value | Long-term users | |
| Nordic Naturals D3+K2 Gummies | D3 + MK-7 Gummies | 1 gummy | Great-tasting, third-party tested | Pill-averse individuals | 🥇 Best Gummy |
Note: Product specifications and formulations may change. Please verify current details on Amazon before purchasing.
MK-7 vs. MK-4: Which Form Should You Choose?
Vitamin K2 exists in several forms, but two dominate the supplement market: MK-4 (menaquinone-4) and MK-7 (menaquinone-7). Understanding the differences may help you select the right supplement for your needs.
MK-7 (Menaquinone-7)
Pros: MK-7 has a significantly longer half-life in the body (approximately 72 hours), meaning it remains active longer and maintains more stable blood levels with once-daily dosing. It’s typically derived from natto or chickpea fermentation and requires lower doses (100-200 mcg) for effectiveness. Most clinical studies examining vitamin K2’s effects on bone and cardiovascular health have used MK-7.
Cons: Some individuals report sensitivity to natto-derived MK-7 (though chickpea-derived options exist). It takes longer to build up in the body compared to MK-4.
Best for: General bone and cardiovascular support, convenience of once-daily dosing, those seeking long-term supplementation.
MK-4 (Menaquinone-4)
Pros: MK-4 is the form naturally found in animal tissues and breast milk, and research suggests it may have unique benefits for brain health and hormone function. It absorbs quickly and is the form your body converts other K vitamins into.
Cons: MK-4 has a short half-life (just a few hours), requiring multiple daily doses or much higher single doses (typically 15-45 mg in studies) to maintain therapeutic levels. It’s often more expensive per effective dose.
Best for: Those specifically interested in potential cognitive benefits, individuals taking high-dose therapeutic protocols under practitioner guidance.
Full-Spectrum Formulas
Several products combine K1, MK-4, and MK-7 to provide comprehensive coverage. This approach may be particularly beneficial since each form appears to concentrate in different tissues—MK-4 in the brain and reproductive organs, MK-7 in bones and arteries. For most people seeking general health support, a full-spectrum formula or standalone MK-7 offers the best balance of convenience and effectiveness.
Individual Product Reviews
Life Extension Super K — Best Overall
Life Extension Super K delivers the most comprehensive vitamin K formula available, combining all three major forms at clinically relevant doses in a single daily softgel.
Life Extension has built a reputation for science-backed formulations, and Super K exemplifies this approach. Each softgel provides 2,000 mcg of K1 (phytonadione), 1,000 mcg of MK-4, and 180 mcg of MK-7 as MenaQ7 (the most clinically studied MK-7 ingredient). This combination addresses the potential benefits of each form while keeping supplementation simple.
The inclusion of vitamin C (as ascorbyl palmitate) may help protect the fat-soluble vitamins from oxidation. The formula uses extra virgin olive oil as the base, which may enhance absorption of these fat-soluble nutrients. Third-party testing and cGMP manufacturing add quality assurance.
Key Specifications:
- Form: Softgel
- Vitamin K1: 2,000 mcg
- Vitamin K2 (MK-4): 1,000 mcg
- Vitamin K2 (MK-7): 180 mcg (as MenaQ7)
- Count: 90 softgels (3-month supply)
- Certifications: Non-GMO, gluten-free
Considerations: The comprehensive formula comes at a higher cost than standalone MK-7 supplements. Those only wanting MK-7 may prefer a simpler product.
Thorne Vitamin K — Best Premium/Practitioner-Grade
Thorne’s full-spectrum vitamin K formula delivers therapeutic-level MK-4 (5 mg) alongside K1 and MK-7, making it the go-to choice for healthcare practitioners and quality-focused consumers.
Formerly known as 3-K Complete, Thorne’s Vitamin K supplement stands out for its exceptionally high MK-4 content—5,000 mcg (5 mg) per capsule. This is significant because most MK-4 research uses doses in the milligram range, not micrograms. Combined with 1,000 mcg of K1 and 90 mcg of MK-7, this formula provides serious coverage across all K vitamin forms.
Thorne is trusted by over 100 professional sports teams and major medical institutions like the Mayo Clinic. Their products undergo four rounds of testing and are third-party certified for purity. The company maintains complete manufacturing control and uses no unnecessary additives.
Key Specifications:
- Form: Vegetable capsule
- Vitamin K1: 1,000 mcg (1 mg)
- Vitamin K2 (MK-4): 5,000 mcg (5 mg)
- Vitamin K2 (MK-7): 90 mcg
- Count: 60 capsules (1-2 month supply)
- Certifications: Gluten-free, dairy-free, soy-free, third-party certified
Considerations: The high MK-4 dose makes this a premium-priced option. Those on blood thinners should exercise particular caution with this formula given its potency.
InnovixLabs Full Spectrum Vitamin K2 — Best Value Full-Spectrum
InnovixLabs delivers both MK-4 and MK-7 in their highly bioavailable trans forms, earning ConsumerLab’s Top Pick designation and providing excellent value for quality-conscious buyers.
This small-batch supplement from a family-owned company has earned recognition from ConsumerLab.com as a Top Pick for vitamin K supplements. Each softgel provides 500 mcg of MK-4 and 100 mcg of MK-7, both in their bioactive trans configurations (important because inactive cis-form MK-7 can be present in lower-quality products).
InnovixLabs emphasizes third-party testing and transparency about their manufacturing processes. The formula is soy-free (the MK-7 is derived from fermentation, not soy-based natto), making it suitable for those with soy sensitivities. The company is known for responsive customer service and a genuinely customer-focused approach.
Key Specifications:
- Form: Softgel capsule
- Vitamin K2 (MK-4): 500 mcg
- Vitamin K2 (MK-7): 100 mcg (trans-form)
- Count: 90 softgels (3-month supply)
- Certifications: Soy-free, gluten-free, allergen-friendly, third-party tested
Considerations: Does not include K1, which some full-spectrum seekers may prefer. The softgel form means it’s not suitable for strict vegetarians.
Doctor’s Best Natural Vitamin K2 MK-7 — Best MenaQ7 MK-7
Doctor’s Best offers pure, patented MenaQ7 vitamin K2 at a competitive price point, backed by the clinical research supporting this specific ingredient.
When you want straightforward MK-7 supplementation using the most clinically studied ingredient, Doctor’s Best delivers. MenaQ7 is produced by Gnosis by Lesaffre (formerly NattoPharma) and has been used in numerous clinical trials examining vitamin K2’s effects on bone density and cardiovascular health.
Each vegetarian capsule provides 100 mcg of MenaQ7-sourced MK-7, which research suggests may be sufficient for most adults. The formula is vegan-friendly, non-GMO, and free from gluten and soy. Doctor’s Best has built a strong reputation over decades for science-based, affordable supplements.
Key Specifications:
- Form: Vegetable capsule
- Vitamin K2 (MK-7): 100 mcg (as MenaQ7)
- Count: 60 capsules (2-month supply)
- Certifications: Vegan, non-GMO, gluten-free, soy-free
Considerations: Standalone MK-7 without MK-4 or K1. Those wanting comprehensive coverage should consider a full-spectrum formula.
NOW Foods MK-7 Vitamin K-2 — Best Budget Option
NOW Foods delivers reliable MenaQ7-based vitamin K2 at one of the lowest costs per serving, backed by their long-standing reputation for quality and value.
NOW Foods has been a family-owned supplement company since 1968, known for making quality supplements accessible to budget-conscious consumers. Their MK-7 vitamin K-2 uses the same MenaQ7 ingredient found in premium brands at a fraction of the cost.
The formula provides 100 mcg of MK-7 from chickpea fermentation (soy-free MenaQ7), making it suitable for those avoiding soy-based products. NOW maintains GMP certification and conducts rigorous testing at their own facilities. The product is available in 60, 120, and 180-count bottles for additional savings.
Key Specifications:
- Form: Vegetable capsule
- Vitamin K2 (MK-7): 100 mcg (as MenaQ7 from chickpea)
- Count: 60 capsules (2-month supply)
- Certifications: Non-GMO, kosher, vegan/vegetarian, GMP certified
Considerations: Basic formula without additional K vitamins. The capsules are larger than some alternatives.
Sports Research Vitamin D3 + K2 — Best Vegan D3+K2 Combo
Sports Research combines plant-based vitamin D3 from lichen with soy-free K2 from chickpeas in a Non-GMO Project Verified formula, making it the top choice for vegans and clean-label enthusiasts.
Finding a truly vegan D3+K2 supplement is challenging since vitamin D3 typically comes from lanolin (sheep’s wool oil) and K2 often from soy-based natto. Sports Research solved both issues by sourcing D3 from lichen and K2 from fermented chickpeas, encapsulated in their proprietary PlantGel (carrageenan-free plant-based softgel).
Each softgel provides 5,000 IU of D3 and 100 mcg of K2 as MK-7, with coconut MCT oil added to enhance absorption of these fat-soluble nutrients. The formula has earned Non-GMO Project Verification and Vegan Certification. Recent formulation updates include a turmeric-based coating to protect ingredients from light degradation.
Key Specifications:
- Form: PlantGel softgel (vegan)
- Vitamin D3: 5,000 IU (from lichen)
- Vitamin K2 (MK-7): 100 mcg (from chickpeas)
- Additional: Coconut MCT oil
- Count: 60 softgels (2-month supply)
- Certifications: Vegan Certified, Non-GMO Project Verified, soy-free, gluten-free
Considerations: Contains tree nuts (coconut). Higher D3 dose than some may need; those with normal vitamin D levels might prefer a lower-dose option or standalone K2.
Solgar Naturally Sourced Vitamin K2 MK-7 — Best Whole Food Source
Solgar’s vitamin K2 uses natto-extracted MK-7 in amber glass bottles, representing 75+ years of commitment to natural-source, high-quality supplementation.
For those who prioritize whole food-derived nutrients, Solgar’s K2 supplement extracts MK-7 directly from natto, the traditional Japanese fermented soybean dish that has been consumed for centuries. This natural sourcing appeals to consumers skeptical of synthetic or heavily processed ingredients.
Solgar has maintained manufacturing standards since 1947, packaging their supplements in signature amber glass bottles to protect ingredients from light degradation. Their products are produced in small batches with rigorous quality control. The vegetable capsule formula suits lacto-vegetarians.
Key Specifications:
- Form: Vegetable capsule
- Vitamin K2 (MK-7): 100 mcg (from natto extract)
- Count: 50 capsules
- Certifications: Non-GMO, gluten-free, suitable for lacto-vegetarians
Considerations: Contains soy (from natto). Lower count bottle means more frequent reordering. Contains milk-derived ingredients.
Healthy Origins Vitamin K2 MK-7 — Best Clean Ingredients
Healthy Origins uses organic extra virgin olive oil and natto-derived MK-7 in one of the cleanest K2 formulas available, earning ConsumerLab approval for quality.
This family-owned brand (since 1996) takes a minimalist approach to their K2 formula. The MK-7 is derived from fermented natto using traditional methods, suspended in organic extra virgin olive oil—a notably cleaner base than the cheaper oils found in many supplements. ConsumerLab has approved this product through their quality certification program.
The vegetarian softgels use non-GMO modified tapioca starch rather than animal-derived gelatin. Non-GMO sunflower lecithin serves as an emulsifier. The result is a remarkably clean ingredient list with no controversial additives.
Key Specifications:
- Form: Vegetarian softgel
- Vitamin K2 (MK-7): 100 mcg (from natto)
- Base: Organic extra virgin olive oil
- Count: 180 softgels (6-month supply)
- Certifications: Non-GMO, gluten-free, soy-free, vegetarian
Considerations: Contains beeswax (not suitable for strict vegans). Slightly higher cost than some budget options.
Nutricost Vitamin K2 MK-7 — Best Bulk Value
Nutricost delivers straightforward MK-7 supplementation in a 240-count bottle, offering an 8-month supply at exceptional value for long-term users.
For those committed to long-term K2 supplementation, Nutricost’s 240-count bottle eliminates the hassle of frequent reordering while delivering solid cost-per-serving value. Each softgel provides 100 mcg of MK-7 in a sunflower seed oil base.
Nutricost has built a reputation for no-frills supplements that deliver exactly what they claim. Their products are manufactured in a GMP-compliant facility and undergo third-party testing. The small, easy-to-swallow softgels suit those who dislike large capsules.
Key Specifications:
- Form: Softgel
- Vitamin K2 (MK-7): 100 mcg
- Base: Sunflower seed oil
- Count: 240 softgels (8-month supply)
- Certifications: Non-GMO, gluten-free
Considerations: Contains gelatin (not vegetarian). Less established brand than some competitors, though quality appears solid.
Nordic Naturals Vitamin D3 + K2 Gummies — Best Gummy
Nordic Naturals combines their legendary quality standards with a genuinely delicious pomegranate gummy, making vitamin D3+K2 supplementation enjoyable for pill-averse individuals.
Nordic Naturals built their reputation on exceptional fish oil quality and has applied the same standards to their vitamin supplements. These gelatin-free gummies provide 1,000 IU of D3 and 45 mcg of K2 (as MK-7) in a natural pomegranate flavor that earns consistent praise for taste.
Every batch undergoes third-party testing verified by ISO-accredited laboratories. The formula uses highly absorbable forms of both nutrients—cholecalciferol for D3 and menaquinone-7 for K2. The vegetarian, gluten-free, and dairy-free formula suits most dietary needs.
Key Specifications:
- Form: Vegetarian gummy
- Vitamin D3: 1,000 IU (25 mcg)
- Vitamin K2 (MK-7): 45 mcg
- Flavor: Natural pomegranate
- Count: 60 gummies (2-month supply)
- Certifications: Non-GMO, vegetarian, gluten-free, dairy-free, no artificial colors/flavors
Considerations: Lower K2 dose than capsule options. Contains sugar (though natural). Higher cost per serving than capsule alternatives.
Buying Guide: What to Look For
Form of K2
For most people, MK-7 offers the best combination of effectiveness, convenience, and research support. If you’re interested in cognitive benefits or following a practitioner’s protocol, look for formulas with MK-4. Full-spectrum formulas provide comprehensive coverage but at higher cost.
Dose
Research suggests 100-200 mcg of MK-7 daily may be sufficient for general health maintenance. Higher doses (up to 360 mcg) have been used in some studies. MK-4 requires much higher doses (1,000-45,000 mcg) due to its rapid metabolism.
Source and Quality Indicators
- MenaQ7: The most clinically studied MK-7 ingredient, produced by Gnosis by Lesaffre.
- Trans-form MK-7: The bioactive configuration; some products contain inactive cis-form MK-7.
- Third-party testing: Look for NSF, ConsumerLab, or USP verification.
- Soy-free options: Chickpea-fermented MK-7 (like MenaQ7) avoids soy concerns.
Combination Products
D3+K2 combinations make sense since both nutrients work synergistically in calcium metabolism. Ensure the D3 dose matches your needs—5,000 IU may be too high if you already have adequate vitamin D levels.
Red Flags to Avoid
- Products that don’t specify MK-4 or MK-7 (just “vitamin K2”)
- Unusually low prices that suggest quality compromises
- No third-party testing or quality certifications
- Proprietary blends that hide actual K2 amounts
How to Take Vitamin K2
Recommended Dosage
Most research and product formulations suggest 100-200 mcg of MK-7 daily for general health support. Some practitioners recommend higher doses for specific therapeutic goals. MK-4, if used, typically requires 1,000-45,000 mcg daily due to its short half-life.
Best Time to Take
Vitamin K2 is fat-soluble, so absorption improves when taken with a meal containing dietary fat. Morning or evening works equally well—consistency matters more than timing. If taking a D3+K2 combination, taking it with your largest meal of the day may optimize absorption of both nutrients.
Duration
Vitamin K2 is generally suitable for long-term daily use. Benefits for bone density, based on research, may take 1-3 years to become measurable. There’s no evidence suggesting the need for cycling or breaks with typical supplemental doses.
Storage
Store vitamin K2 supplements in a cool, dry place away from direct sunlight. Some products (like Sports Research) include light-protective coatings; those without may benefit from storage in their original opaque container.
Potential Benefits of Vitamin K2
Bone Health
Vitamin K2 activates osteocalcin, a protein that helps bind calcium to the bone matrix. A three-year study published in Osteoporosis International found that MK-7 supplementation may help maintain bone mineral density in postmenopausal women. Research suggests K2 may be particularly beneficial when combined with vitamin D and calcium.
Cardiovascular Support
K2 activates matrix Gla protein (MGP), which may help prevent calcium from depositing in arterial walls. The Rotterdam Study, following nearly 5,000 participants over 10 years, found associations between higher dietary K2 intake and cardiovascular health. However, more research is needed to confirm supplementation benefits.
Dental Health
Some evidence suggests vitamin K2 may support dental health by directing calcium to tooth enamel. This has generated interest in K2 for dental remineralization, though clinical evidence remains preliminary.
Additional Areas of Research
Early research is exploring K2’s potential roles in blood sugar metabolism, cognitive function (particularly MK-4), and healthy aging. These areas require more human studies before conclusions can be drawn.
Safety Considerations
Potential Side Effects
Vitamin K2 is generally well-tolerated at typical supplemental doses. Some people report mild digestive upset, which often resolves when taking supplements with food. High doses may cause skin flushing in sensitive individuals.
Drug Interactions
Critical warning: Vitamin K (all forms) directly counteracts anticoagulant medications like warfarin (Coumadin). If you take blood thinners, consult your healthcare provider before taking any vitamin K supplement. Even small amounts can affect medication efficacy and require dose adjustments.
Who Should Be Cautious
- Anyone taking anticoagulant medications
- People with bleeding disorders
- Those scheduled for surgery (discuss with your surgeon)
- Pregnant or nursing women (consult healthcare provider first)
- People with liver disease
When to Consult a Healthcare Provider
Before starting vitamin K2 supplementation, speak with a healthcare provider if you have any cardiovascular conditions, take medications regularly, or have concerns about interactions with existing supplements or health conditions.
Frequently Asked Questions
Q: Can I get enough vitamin K2 from food?
A: It’s challenging for most Western diets. The richest source is natto (a fermented soybean dish), which provides about 1,000 mcg per serving. Egg yolks, butter from grass-fed cows, and certain cheeses contain smaller amounts. Most people don’t consume these foods regularly enough to maintain optimal K2 levels.
Q: Should I take vitamin K2 with vitamin D?
A: Many practitioners recommend this combination. Vitamin D increases calcium absorption, while K2 helps direct that calcium to bones rather than soft tissues. If you supplement with vitamin D, adding K2 may help ensure calcium is properly utilized.
Q: Is MK-7 or MK-4 better?
A: MK-7 is generally more practical for most people due to its longer half-life and once-daily dosing. MK-4 may have unique benefits for certain applications but requires higher doses and more frequent administration. Full-spectrum formulas containing both cover all bases.
Q: How long until I see benefits from vitamin K2?
A: K2’s effects on calcium metabolism begin quickly, but measurable changes in bone density typically require 1-3 years of consistent supplementation, based on clinical studies. Cardiovascular benefits may also take time to manifest.
Q: Can I take too much vitamin K2?
A: No upper limit has been established for vitamin K2, and no toxicity has been reported from supplemental doses. However, more isn’t necessarily better—standard doses of 100-200 mcg MK-7 appear effective for most purposes.
Q: Does vitamin K2 thin or thicken blood?
A: Vitamin K promotes normal blood clotting (thickening), which is why it counteracts blood-thinning medications. For most healthy people not on anticoagulants, this is not a concern, as K2 simply supports normal clotting function.
Q: Is vitamin K2 safe during pregnancy?
A: Vitamin K is essential during pregnancy, and adequate intake supports fetal development. However, pregnant women should consult their healthcare provider before supplementing, as dosing requirements may differ from general recommendations.
Q: Why do some K2 supplements contain soy?
A: Traditional MK-7 is extracted from natto, a fermented soybean product. For those avoiding soy, chickpea-fermented MK-7 (like MenaQ7) provides a soy-free alternative with equivalent benefits.
Bottom Line: Our Recommendations
For most people seeking comprehensive support: Life Extension Super K provides the most complete formula with K1, MK-4, and MK-7 at clinically relevant doses.
For budget-conscious buyers: NOW Foods MK-7 K2 delivers patented MenaQ7 at excellent value from a trusted manufacturer.
For premium quality seekers: Thorne Vitamin K offers practitioner-grade quality with therapeutic MK-4 dosing.
For verified quality at reasonable cost: InnovixLabs Full Spectrum K2 earned ConsumerLab’s Top Pick designation while remaining affordable.
For vegans: Sports Research D3+K2 provides the only Non-GMO Project Verified, fully plant-based D3+K2 combination.
For those who dislike pills: Nordic Naturals D3+K2 Gummies makes supplementation genuinely enjoyable with great taste and trusted quality.
