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Specs are compiled from manufacturer listings and verified buyer reviews and can change over time — please confirm the key details on the product page before buying.
You want Vitamin K2 to send calcium into your bones and teeth, not your arteries. The real choice is between two forms—MK-4 and MK-7—plus if you want it paired with Vitamin D3. Here is what each form does, what dose studies actually use, and which bottles are worth your money.
I’m Min — the founder and writer behind Gadgets Feed. This guide is built by comparing the manufacturers’ published specifications and the patterns across verified customer reviews, so you get each pick’s real strengths and trade-offs instead of marketing spin.
Let’s break down the top Vitamin K2 supplements on the market and find the one that fits your health goals.
Our Picks at a Glance
How To Choose The Best Vitamin K2
Before you click buy, you need to know which of the two main forms of K2 you’re actually getting. Both are called “K2,” but your body treats MK-4 and MK-7 very differently, and the right choice depends on what you’re trying to support.
Understand the MK-4 vs MK-7 distinction
MK-7 comes from fermented foods like natto and stays active in your bloodstream much longer, so you can take a small daily dose like 100 mcg for bone and heart support. MK-4 is the form used in high-dose Japanese osteoporosis studies, often at 45 mg (that’s 45,000 mcg) per day, but it clears out faster, so you need to take it more often. Some blends combine both, giving you the long-acting coverage of MK-7 plus the quick response of MK-4.
Decide if you want a D3 + K2 combo
Vitamin D3 helps you absorb calcium from food, and K2 helps direct that calcium into bones. Many buyers prefer a single capsule that pairs D3 with K2 for convenience. But some reviewers deliberately avoid combined pills, because research suggests taking them together in one dose might not be ideal for everyone, and they prefer the flexibility of dosing each nutrient separately.
Check the dose against real evidence
Look for the actual micrograms or milligrams on the label, not vague marketing claims. A typical MK-7 supplement offers 100 mcg per serving, which is a solid daily maintenance dose. A high-dose MK-4 product like Life Extension’s Mega Vitamin K2 delivers 45 mg per capsule, which matches the pharmacological dose studied for bone support—a dramatically different number that tells you exactly what that product is designed for.
Quick Comparison
| Model | Best For | K2 Form(s) | Dose per Serving | Servings per Bottle | Amazon |
|---|---|---|---|---|---|
| Now Supplements D3 K2★ Best Overall | Daily D3 + K2 combo | MK-7 | 45 mcg | 180 | Amazon |
| Horbäach K2 MK7Best Value | Value-packed MK-7 softgels | MK-7 | 100 mcg | 250 | Amazon |
| Maxx Labs Super K2Full Spectrum | Full-spectrum MK-4 + MK-7 blend | MK-4 + MK-7 | 600 mcg | 90 | Amazon |
| Superior Source K2 MK-7 | Sublingual, easy-to-take tablets | MK-7 | 100 mcg | 60 | Amazon |
| Carlson K2 MK-4 | High-dose MK-4 capsules | MK-4 | 5 mg | 60 | Amazon |
| BulkSupplements K2 MK7 | Year-long supply at a budget price | MK-7 | — | 365 | Amazon |
| Triquetra Total K2 | Organic, full-spectrum with K1 | MK-4 + MK-7 + K1 | 620 mcg K2 | 60 | Amazon |
| Life Extension Mega K2 | Clinically studied high-dose MK-4 | MK-4 | 45 mg | 30 | Amazon |
| NATURELO D3 K2 | Vegan D3 + K2 combination | MK-7 | — | 60 | Amazon |
In-Depth Reviews
1. Now Supplements Vitamin D3 K2, 1,000 IU/45 mcg
Our pick — over 4.5★ from 800+ verified ratings; the strongest balance of quality and price.
The crowd-pleasing D3 + K2 twin-pack that solves two nutrient gaps in one daily capsule.
If you want the convenience of pairing your K2 with Vitamin D3, this is the bottle to beat. It delivers 1,000 IU of D3 alongside 45 mcg of K2 in a single vegetarian capsule, so you cover both calcium absorption and calcium direction in one easy swallow. The formula is Non-GMO, Kosher, and Soy Free, which removes three common dietary hurdles in one shot.
This is also a brand with serious staying power—NOW has been packaging supplements in the USA since 1968, and their GMP certification means every step of the manufacturing process is examined for stability, potency, and formulation. Buyers report that a low D level causing memory issues was raised to mid-range in bloodwork, and they’ve maintained this dose for over 4 years. Others note the capsules are tasteless and easy to swallow, with no unpleasant side effects.
The one trade-off is the K2 dose itself. At 45 mcg, it’s a lower amount than many standalone K2 supplements offer, which makes sense because it’s designed as a foundational daily combo rather than a high-dose therapy. If you’re already taking a separate high-dose K2, this might overlap.
Why buyers stick with it
- Quality is the headline—the most-cited positive in owner feedback
- Vegan capsules fit plant-based diets easily
- Trusted brand with decades of manufacturing history
The trade-off to know
- 45 mcg of K2 is on the lower end for those wanting a high dose
- Veggie capsules may not suit those who prefer softgels
Reach for this if: you want a clean, no-fuss D3 + K2 combo from a name you can trust, and a moderate K2 dose is plenty for you.
Look elsewhere if: you specifically need a high-dose MK-4 or MK-7 therapy, since this tops out at 45 mcg.
2. Horbäach Vitamin K2 MK7 100mcg
A 250-softgel supply of 100 mcg MK-7 that makes daily K2 about as affordable as it gets.
Here’s a pure MK-7 option that leans on quick-release softgels to deliver a solid 100 mcg of Vitamin K2 for daily support. With 250 softgels in the bottle, this is a set-and-forget purchase that will carry you through months of consistent dosing. The formula is naturally free of gluten, wheat, yeast, milk, lactose, artificial flavor, and sweetener, which is a long list of avoidances for sensitive buyers.
Buyers call it “good price for this high quality Vitamin K2,” and one owner with a thyroid disorder noticed their nails weakened right away when they missed a dose or two—a sign of how fast the body responds. Horbäach backs it with a 100% guarantee and says it is laboratory tested with trusted ingredients.
The recurring gripe in the review pages is the black color of the softgels, which some owners view as a defect even though it doesn’t affect the product’s function. It’s a cosmetic quirk, not a performance issue, but it’s worth knowing if you’re particular about appearance.
The 100 mcg balance: this dose of MK-7 gives you strong daily support without being overpowering, and owners mention effectiveness and value are the two biggest wins.
Pick this for: a long-lasting, budget-friendly MK-7 softgel that keeps your daily dose consistent while staying affordable.
A fair warning: the dark color of the softgels bothers some owners, so swap it out if appearance matters more than function to you.
3. Vitamin K2 Supplement 600 mcg with K2-MK7, MK4 & Vitamin D
A maximalist K2 blend that stacks both essential forms plus Vitamin D in one 600 mcg punch.
This Maxx Labs formula is for the buyer who wants everything in one capsule. It delivers 600 mcg of K2 split between MK-4 and MK-7 in a balanced ratio, and adds Vitamin D to the mix. The theory is that the two forms of K2 work along different biological pathways, so you get the long-acting coverage of MK-7 plus the rapid-response benefits of MK-4. The formula also uses bioactive TRANS forms of both, which means your body can actually absorb them.
The reviews read like a before-and-after story for joint comfort. One reviewer noted reduced joint popping, knee cracking, and tooth pain within 2 weeks of use. A long-term user since 2016 notes this formula with Vitamin D preserves bone density better than regular K, easing joint spurs and pain. Buyers also highlight the small capsule size as a plus, making it easy to swallow.
Note that this bottle stacks a hefty dose, so it’s aimed at people who want aggressive K2 support rather than a gentle daily maintenance amount. If you’re new to K2, you might prefer to start lower.
Why this one stands out: the dual-form approach means you’re not choosing between MK-4 and MK-7—you’re getting both, and the quality feedback is the most-mentioned positive by far.
The honest take: 600 mcg is a strong dose, so ease in slowly if you’re not used to K2 supplementation.
Best for: anyone with joint discomfort or bone-density concerns who wants the full-spectrum MK-4 + MK-7 approach in a single daily pill.
Think twice if: you prefer a lower, simpler K2 dose or want to control D3 separately, since this bundles it in.
4. Superior Source Vitamin K2 MK-7 100 mcg Sublingual Tablets
A tiny 0.6-ounce bottle of sublingual tablets that skip the swallowing struggle entirely.
If you hate swallowing pills, this is your answer. Superior Source formulates K2 as tiny sublingual tablets that dissolve quickly under your tongue, getting the 100 mcg of MK-7 into your system without needing a glass of water. The bottle is remarkably compact at just 1.44 x 1.44 x 2.38 inches, making it the most portable option here—it slips into a pocket or a purse without a second thought. This form factor is also marketed as bariatric-friendly, which matters if you have trouble with larger capsules.
Superior Source has been making sublingual vitamins since 1998 in a family-owned facility, so this isn’t a gimmick form factor—it’s their specialty. Customers note improved lab work and skin health, with some noting benefits for arterial calcification. The taste gets mixed reviews: some enjoy the mild pleasant flavor, while others find it unpleasant. It dissolves fast, and the small pill size wins consistent praise.
The honest caution here is that the taste is polarizing. If you’re sensitive to flavors under your tongue, this might not be the daily ritual you want. But if you struggle with swallowing capsules, the trade-off is worth it.
Why it’s different: the sublingual delivery means faster dissolution and no swallowing, and it packs the same 100 mcg MK-7 punch as a standard pill.
Choose this if: swallowing pills is a daily battle or you want the most travel-friendly K2 bottle on the shelf.
A real note: the flavor is hit-or-miss, so if you’re taste-sensitive, sample it before committing to a long-term supply.
5. Carlson Vitamin K2 MK-4 (Menatetrenone), 5 mg
A dedicated 5 mg MK-4 capsule that’s one of the few high-dose options standing alone on shelves.
Carlson takes a different lane than most of this list by offering K2 purely as MK-4 at a serious 5 mg dose. This isn’t a daily maintenance amount—it’s a step toward the higher-dose MK-4 approach that Japanese studies have used for osteoporosis treatment for years. The capsules are completely soy-free, and Carlson has been testing every batch through an independent, FDA-registered laboratory since 1965.
This product is for the buyer who’s done their research and specifically wants MK-4, not MK-7. If you’re just starting out with K2 and don’t know which form you need, this higher dose might be more than you need to begin with.
The MK-4 argument: it’s the form used in clinical osteoporosis studies, and effectiveness is the most-praised aspect by a wide margin in owner feedback.
Reach for this if: you’ve researched the MK-4 vs MK-7 debate and want a high, isolated dose of MK-4 without any filler ingredients.
skip it if: you want a lower-dose everyday K2 or prefer the longer-lasting MK-7 form.
6. BulkSupplements.com Vitamin K2 MK7 Softgels
A 365-count softgel bottle that turns daily K2 into a once-a-year stocking decision.
This is the bulk-play of the list, offering a full year’s supply of K2 MK7 softgels in a single 365-count bottle. If you’re tired of reordering supplements every month, this removes that chore entirely. The softgels are designed to be easy to swallow and can be taken alongside your first meal of the day, which makes it simple to build a consistent habit.
Buyers specifically praise the decision to keep K2 separate from D3. One owner points out that research suggests you shouldn’t mix K2 and D3 in the same pill, and this formula gives enough K2 that you can take it separately with your calcium or D3 regimen. Others note it’s a good price for a full year’s supply and that the small capsules are easy to swallow.
There is some split opinion on the soybean oil content in the softgels, with a few buyers expressing concerns about the ingredient. If you’re sensitive to soy or want to avoid it entirely, you’ll want to check the label closely before committing to this large bottle.
The big win: quality is the most-praised aspect, and the 365-count format means you won’t think about reordering for a full year.
Pick this for: the low-maintenance buyer who wants a year of MK-7 without monthly reordering, and who takes D3 separately.
A fair caution: the soybean oil in the softgels is a point of concern for some, so avoid this if soy is a dealbreaker for you.
7. Triquetra Health Total K2 with MK7, MK4, K1 & D3
A USDA-certified organic powerhouse that piles K2, K1, and D3 into one full-spectrum capsule.
If you want every vitamin K family member in one place, Triquetra’s Total K2 delivers. This formula stacks both K2 forms—MK-7 and MK-4—at a combined 620 mcg per serving, then adds Vitamin K1 for blood clotting support and Vitamin D3 as a cofactor. That’s full-spectrum coverage in a single daily capsule. The MK-7 here comes from MenaQ7, a branded, well-researched source, and it’s the all-trans form, which is the 100% bioactive version that your body can actually use.
This is also the rare K2 product that’s USDA Organic Certified, vegan, and third-party tested for over 100+ toxins and microbes. Reviewers point out significant improvements in bone and joint health, and One owner noted that after a year of use, they stopped developing large bruises after blood draws—a sign the K1 component corrected a deficiency. Some note they can adjust the dose easily since the capsules are easy to split.
The trade-off is that this comprehensive formula comes with a mixed response on side effects—while most report none, a few mention feeling sick after taking it.
Why it’s premium: quality and effectiveness lead owner feedback, and the USDA organic certification plus 100+ toxin testing puts it in a trust tier most competitors don’t reach.
Best for: the buyer who wants the most complete Vitamin K spectrum available—K1, MK-4, and MK-7—with organic certification as a non-negotiable.
Think twice if: you’re new to K2 or sensitive to high doses, since the broad-spectrum 620 mcg blend is a lot to start with.
8. Life Extension Mega Vitamin K2, 45 mg
A 45 mg MK-4 capsule that matches the exact pharmacological dose used in Japanese bone studies.
This is the heavy hitter. Life Extension’s Mega Vitamin K2 delivers 45,000 mcg (45 mg) of MK-4 per capsule, which is the clinically studied dose shown to be effective for those who need the most support. This is the pharmacological dose that’s approved in Japan for osteoporosis treatment, so if you’re serious about bone density, this is the therapeutic-level option on this list. The capsules are tiny and easy to swallow despite the massive dose.
The reviews reflect a specific buyer: people with diagnosed bone-density concerns. One owner with low bone density uses this with weight-bearing exercise, D3, and calcium to prevent bone disease without pharmaceuticals. Another notes it’s one of the few high-dose K2 supplements available, with a quality manufacturer behind it. Effectiveness is the most-praised aspect by a wide margin.
The honest caveat is that this dose isn’t for everyone. Some buyers find it expensive for 30 capsules, and there’s disagreement on whether the dose is right for their needs, with a few reporting lightheadedness. This is a targeted therapy, not a gentle daily supplement.
The dose is the story: 45 mg of MK-4 is the studied therapeutic amount, and buyers confirm it mobilizes calcium into bones effectively.
Reach for this if: you have specific bone-density goals and want the clinically studied 45 mg MK-4 dose in a small, easy-to-swallow capsule.
Look elsewhere if: you want a maintenance-level K2 dose or are sensitive to high amounts—this is a therapeutic product, not a daily multivitamin add-on.
9. NATURELO Vitamin D3 K2, Vegan, 60 Capsules
A completely plant-based D3 + K2 capsule for vegans who refuse to source D3 from sheep lanolin.
This is the vegan purist’s pick. Most Vitamin D3 supplements are made from lanolin secreted from sheep skin, but NATURELO sources its D3 from wild-harvested lichen, making it completely plant-based. The K2 comes as MK-7, the bioactive form with better bioavailability in humans. Together, they direct calcium into your bones and away from arteries and soft tissues, supporting both bone density and healthy blood vessels.
The formula is clean across the board—non-GMO, vegetarian, vegan, gluten-free, and free of soy, dairy, eggs, fish, nuts, preservatives, and coloring. Buyers who’ve been with the brand for around a decade praise the approach, with one noting they avoided vitamins entirely before finding NATURELO because they doubted absorption from other products. Others appreciate that the capsule combines D3 and K2 in one easy-to-swallow dose.
The recurring criticism is the price point. At 60 capsules, this bottle is described by more than one buyer as “overpriced” compared to competitors offering 120 capsules for about the same price. The quality is consistently praised, but the value-for-money verdict is mixed.
Why it’s worth a look: quality and natural ingredients lead owner praise, and the plant-based D3 sourcing is genuinely rare in this category.
Choose this if: you’re vegan and want a D3 + K2 combo that’s fully plant-based, with clean-label sourcing you can verify.
Be aware: you’re paying a premium for the vegan D3 sourcing—if budget is the priority, a non-vegan combo will stretch further.
Understanding the Specs
MK-7 vs MK-4 — which form is in your bottle?
The two forms of K2 are not interchangeable. MK-7, often sourced from natto, stays active in your bloodstream for much longer, so a 100 mcg daily dose is typically enough for steady bone and heart support. MK-4, found in animal sources, clears out of your system much faster and is usually taken in much higher doses—like 5 mg or even 45 mg—to achieve a therapeutic effect. Some premium formulas blend both to get the long-acting coverage of MK-7 plus the rapid response of MK-4.
Reading the dose: micrograms vs milligrams
This is where label confusion happens. A “mcg” is a microgram, and a “mg” is a milligram—1 mg equals 1,000 mcg. So a 600 mcg K2 supplement is 0.6 mg, while Life Extension’s 45 mg capsule is 45,000 mcg. That’s a massive difference in dosing philosophy. A typical MK-7 maintenance dose sits around 100 mcg, while high-dose MK-4 therapy starts at 5 mg and goes up to 45 mg. When comparing bottles, always check which unit is on the label before judging whether a dose is high or low.
FAQ
What is the difference between MK-4 and MK-7 in Vitamin K2 supplements?
Should I take Vitamin K2 with Vitamin D3 or separately?
What does MK-7 stand for and why is it important?
How long does a 90-serving bottle of Vitamin K2 last?
What does a high dose of Vitamin K2 at 45 mg actually mean?
Is it better to buy a K2 supplement that includes Vitamin K1?
Do I need a high-dose MK-4 supplement or is 100 mcg of MK-7 enough?
What should I look for in a vegan Vitamin K2 supplement?
Is it true that Vitamin K2 helps direct calcium into bones?
How does a sublingual Vitamin K2 tablet compare to a standard capsule?
Final Thoughts: The Verdict
For most buyers, the best Vitamin K2 choice is the Now Supplements D3 K2 because it pairs a trusted brand with a clean vegan formula and a sensible daily dose. If you want a budget-friendly pure MK-7 softgel that lasts for months, grab the Horbäach K2 MK7. And if you’re chasing a clinically studied high dose for bone-density goals, the Life Extension Mega K2 is the one to reach for.
How We Picked
We do not accept paid placement. Every pick is matched to a real buyer and a real use-case; we do not hands-on test units.
Sources & Methodology
Specifications: manufacturer listings and product documentation. Review insights: verified customer reviews, as of August 2026. Pricing: not shown on this page (it changes often); check the current price via the retailer link.
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