Best Vitamin K2 Supplement: Top 5, 2026 Tested & Ranked
Quick answer: For most people, the best vitamin K2 supplement is Solgar Natural Vitamin K2 (MK-7) 50 Vcaps — a clean, natto-derived MK-7 capsule at a sensible 50 mcg starting dose from one of the most trusted brands in American retail. If you want the higher 100 mcg dose used in recent bone research, Doctor’s Best Natural Vitamin K2 Featuring MenaQ7 is our top pick in that range, with Now Foods MK-7 100 mcg as the value alternative. Choose MK-7 over MK-4 unless you have a specific reason: it stays in circulation far longer, so one daily capsule is enough.
Updated August · Evaluated against menaquinone dosing used in published bone trials (Knapen et al., Osteoporosis International) and NIH reference intakes.
How We Evaluated These Vitamin K2 Supplements
We scored each product on menaquinone form (MK-7 vs. MK-4 vs. multi-form blends), dose (against the 90–180 mcg/day range used in modern MK-7 trials), format (capsules, tablets, softgels), and value (price per serving against brand reputation). As with all our rankings, “tested” means scored against the published evidence and each product’s label — we did not run independent lab assays, and none of these five carry USP or NSF third-party seals as of this writing.
Vitamin K2 isn’t one compound. It’s a family of menaquinones, and the two that matter in supplements are MK-4 (short-chain, found in animal foods and some supplements) and MK-7 (long-chain, from natto, the fermented soybean staple). Both activate vitamin-K-dependent proteins — most importantly osteocalcin in bone and matrix Gla protein (MGP), which inhibits calcium from depositing in artery walls. The difference is pharmacokinetics: MK-7’s half-life in circulation is roughly three days versus a few hours for MK-4, which is why modern trials and most products use MK-7 once daily.
The bone evidence is real but not uniform. A 2007 three-year trial by Knapen et al. (Osteoporosis International) (PMID: 17287908, PMC1915640) in postmenopausal women found vitamin K2 supplementation improved hip bone geometry and bone strength indices. A later 2013 trial by the same group — published in Osteoporosis International — gave 180 mcg/day of MK-7 for three years to healthy postmenopausal women and found it blunted the age-related decline in bone mineral density and bone strength at the lumbar spine and femoral neck. But a 2021 three-year randomized trial in women with osteopenia found no bone density benefit, and several meta-analyses show the strongest effects in osteoporotic or East Asian populations. So: genuine signal, mixed details. We say so rather than dressing it up.
Evidence note: A 2013 three-year trial in Osteoporosis International found 180 mcg/day of MK-7 slowed age-related bone density and strength loss in healthy postmenopausal women. Results across studies are mixed — several trials show little or no density benefit, so treat K2 as one lever for bone health, not a fix.
The 5 Best Vitamin K2 Supplements
1. Solgar Natural Vitamin K2 (MK-7) 50 Vcaps Best Overall
Solgar’s MK-7 is the definition of a no-drama supplement: one clean vegetable capsule, 50 mcg of natto-derived MK-7, nothing else of consequence on the label. The 50 mcg dose is a reasonable starting point for someone who wants the long-acting menaquinone without jumping straight to the higher trial doses, and it’s easy to take two if you want 100 mcg. Solgar’s manufacturing record and the sheer shelf life of this product — it’s been a mainstay for years — make it the safe recommendation for most people, especially those new to K2.
- Natto-derived MK-7, the long-acting form used in modern research
- Vegan vegetable capsules with a short, clean formula
- Conservative 50 mcg start dose; easy to scale by taking two
- One of the most established brands in the category
- 50 mcg is below the 90–180 mcg range used in bone trials
- Only 50 servings per bottle
- No third-party certification seal
2. Doctor’s Best Natural Vitamin K2 Featuring MenaQ7 Best 100 mcg MK-7
Doctor’s Best uses MenaQ7 — the branded, well-characterized MK-7 ingredient derived from natto that’s been used in several published trials — at 100 mcg, which lands inside the 90–180 mcg range where the 2013 Knapen trial showed benefit. If you’re supplementing K2 for bone reasons specifically, this is the dose-form combination we’d point you to first. Sixty veggie capsules at a fair per-serving price, from a company with a long clinical-supplement history.
- 100 mcg sits in the studied 90–180 mcg daily range
- MenaQ7 is the specific MK-7 ingredient used in published research
- Veggie capsules, 60 servings, reasonable per-serving cost
- Slightly pricier per serving than the Now Foods alternative
- No third-party seal
- 100 mcg is more than a starter dose needs
3. Now Foods MK-7 Vitamin K-2 100 mcg Best Value
Now Foods delivers the same 100 mcg MK-7 dose as our number two at a meaningfully lower price per serving, which makes this the value pick in the higher-dose tier. It’s also vegan and kosher, and Now’s cGMP manufacturing is well established. The choice between Doctor’s Best and Now at 100 mcg comes down to whether you value the MenaQ7 branded ingredient (Doctor’s Best) or the lower cost (Now) — the difference in outcome evidence is negligible at this dose.
- 100 mcg MK-7 in the studied range
- Best per-serving value in the 100 mcg tier
- Vegan and kosher; long brand track record
- No third-party seal
- Same dose as Doctor’s Best — pick mostly on price
- 60 servings per bottle
4. Source Naturals Vitamin K-2 Advantage Best Multi-Form
This is the one supplement on the list that covers the whole vitamin K family in a single tablet: K1 (phylloquinone, the clotting form found in greens) plus both MK-4 and MK-7 menaquinones. If you want one bottle that covers K1’s classical blood-clotting role and K2’s Gla-protein activation, this is it — there’s no equivalent in the other four picks. The trade-off is that spreading the dose across three forms means each individual menaquinone comes in lower than in the dedicated MK-7 products, and 30 tablets is a short supply.
- Only pick covering K1 + MK-4 + MK-7 in one tablet
- Sensible for people who want a single vitamin K supplement
- Source Naturals is a long-established, GMP-based brand
- Each menaquinone dose is lower than in dedicated MK-7 products
- 30 servings — shortest supply on this list
- Multi-form blends are harder to map against trial doses
5. Healthy Origins Vitamin K2 And MK-7 Best Long Supply
Healthy Origins bottles 180 servings of 100 mcg MK-7 in a veggie softgel — about six months of daily dosing in one jar, which makes it the bulk option and a solid value if you’re committed to long-term supplementation. K2 is a fat-soluble nutrient, so the softgel format conveniently pairs the dose with a lipid base, and MK-7 from natto is well suited to this delivery. The trade-offs: it’s a 100 mcg fixed dose, the brand is less prominent than Solgar or Now, and you’re committing to a large bottle before you know if K2 agrees with you.
- 180 servings — roughly six months at one a day
- 100 mcg MK-7 in the studied range
- Veggie softgel format suits a fat-soluble vitamin
- Large bottle is a commitment before you’ve tried it
- Less prominent brand with thinner public quality documentation
- No third-party seal
Vitamin K2 Supplement Comparison Table
| Product | Dose | Form | Servings | Best For |
|---|---|---|---|---|
| Solgar Natural Vitamin K2 (MK-7) | 50 mcg MK-7 | Veggie capsule | 50 | Best overall / starter dose |
| Doctor’s Best Natural K2 MenaQ7 | 100 mcg MK-7 | Veggie capsule | 60 | Studied-dose MK-7 |
| Now Foods MK-7 Vitamin K-2 | 100 mcg MK-7 | Veggie capsule | 60 | Best value 100 mcg |
| Source Naturals K-2 Advantage | K1 + MK-4 + MK-7 | Tablet | 30 | Full vitamin K family coverage |
| Healthy Origins K2 And MK-7 | 100 mcg MK-7 | Veggie softgel | 180 | Long-term supply |
How to Choose a Vitamin K2 Supplement
MK-7 beats MK-4 for daily dosing, for most people. MK-7’s multi-day half-life means one capsule a day maintains steady levels, and it’s the form used in the strongest recent bone trials. MK-4 requires much higher daily amounts (Japanese studies used 15–45 mg, thousands of times the microgram doses here) and multiple doses a day to hold levels — which is why MK-4-only products are increasingly rare in the supplement aisle. If a product blends MK-4 with MK-7, that’s fine; just know the MK-7 is doing the heavy lifting.
Pick a dose with a reason. There’s no official dietary allowance for K2, and no established upper limit — the NIH notes vitamin K deficiency is uncommon in healthy adults and lists no toxicity concerns for K1/K2 at supplemental levels. Practical dosing: 45–100 mcg/day of MK-7 is the common supplement range, while trials showing bone benefit used 90–180 mcg/day. Start at the low end, and if you’re supplementing for a specific bone-health goal, the 100 mcg products are the closer match to the evidence.
Take it with food. K2 is fat-soluble. A capsule swallowed with a meal containing some fat absorbs far better than one taken on an empty stomach — this single habit probably matters more than the brand you choose.
The D3 + K2 pairing, honestly assessed. The popular logic: vitamin D3 increases calcium absorption from the gut, and K2 activates the proteins (osteocalcin, MGP) that direct calcium into bone rather than soft tissue. That’s biologically coherent, but the combination-specific clinical evidence is limited — most trials studied each vitamin separately, and the “calcium routing” story is inferred from mechanisms, not proven in head-to-head combo trials. Taking them together is reasonable and popular; just don’t expect a documented combo effect. And if you take calcium too, stay under the 2,000–2,500 mg/day upper intake.
Warning that matters: If you take warfarin (Coumadin) or any vitamin K antagonist blood thinner, do not start K2 — it directly opposes the drug’s mechanism and can destabilize your INR. This is a “talk to your doctor first” situation, not a “skip a dose” one.
Frequently Asked Questions
Is MK-4 or MK-7 better?
For daily oral supplementation, MK-7 is the practical choice: it stays in circulation for days instead of hours, so one capsule a day maintains steady levels, and it’s the form used in recent placebo-controlled bone trials. MK-4 has its own evidence base — mostly Japanese studies at doses of 15–45 mg/day, far higher than typical supplement labels — but it requires repeated daily dosing. Neither is “wrong”; MK-7 just maps better onto a once-a-day supplement habit.
Should I take vitamin K2 with vitamin D3 and calcium?
It’s a popular and biologically plausible stack: D3 boosts calcium absorption, and K2 activates the proteins that move calcium into bone. But the combo-specific evidence is limited — trials largely studied each nutrient separately, so the “calcium routing” benefit is inferred from mechanism rather than demonstrated in combination studies. It’s a reasonable stack for most people; just respect the calcium upper intake of 2,000–2,500 mg/day from all sources combined.
Can I take vitamin K2 if I’m on blood thinners?
No — not without your doctor’s explicit sign-off. Vitamin K2 activates clotting factors and directly counteracts vitamin K antagonists like warfarin, so supplementing can destabilize your INR and raise clot risk. If you take any anticoagulant or antiplatelet medication, discuss K2 with your prescriber before opening the bottle. There’s no scenario where starting K2 on your own is the right move while on warfarin.
The Bottom Line
For, our ranking: Solgar Natural Vitamin K2 (MK-7) 50 Vcaps as the dependable overall pick, Doctor’s Best MenaQ7 100 mcg for the dose used in bone research, Now Foods MK-7 100 mcg for value, Source Naturals K-2 Advantage for full vitamin K family coverage, and Healthy Origins 180-count for long supply. Whichever you choose, take it with food daily, keep expectations evidence-sized — K2 is one input into bone and vascular health, not a guarantee — and never combine it with warfarin.
Browse the full K-vitamin range at HerbsPro: Vitamin K collection →
Related reading: our best vitamin D3 supplement rankings and best calcium supplement comparison.
Disclaimer: This article is for informational purposes only and is not medical advice. Supplements are not regulated by the FDA for safety or efficacy before they reach the market, and they are not treatments for any disease. Talk to your doctor before starting K2 — especially if you take blood thinners, are pregnant or nursing, or have a medical condition. We may earn a commission when you buy through links on this page; this never affects our rankings or scores.
