Best Vitamin K2 (MK-7) Supplements 2026: Cost per Effective Dose
Top pick for Vitamin K2 (MK-7): Nutricost Vitamin K2 MK-7 100 mcg — 100mcg per 1 softgel, $0.07/day. Our best-value pick.
All Vitamin K2 (MK-7) Supplements Compared
MK-7 is the form worth paying for, because its half-life is measured in days rather than hours — that is why it works as a once-daily capsule while MK-4 needs repeat dosing to hold levels. Most products in the Verified Supplement Data catalog land at 100 mcg of MK-7, which is the dose used in the bone and arterial research. ⚠ Vitamin K directly opposes warfarin: if you take an anticoagulant, do not start K2 without speaking to whoever manages your dosing.
| Product | Brand | Dose / Serving | Cost / Day | Certification (as labelled) | Pick | Buy |
|---|---|---|---|---|---|---|
| Nutricost Vitamin K2 MK-7 100 mcg | Nutricost | 100mcg / 1 softgel | $0.07 | None | Best Value | Buy |
| NOW Foods MK-7 Vitamin K2 100 mcg | NOW Foods | 100mcg / 1 capsule | $0.22 | None | Quality Pick | Buy |
| Life Extension Super K | Life Extension | 1,180mcg / 1 softgel | $0.27 | None | Buy | |
| NOW Foods Vitamin K2 (MK-7) 300 mcg | NOW Foods | 300mcg / 1 capsule | $0.30 | None | Buy | |
| Sports Research Vitamin D3 + K2 | Sports Research | 100mcg / 1 softgel | $0.57 | None | Buy |
Registry check · Vitamin K2 (MK-7)
Does anyone independently verify Vitamin K2 (MK-7) supplements?
We did not find any of these products in a public registry, and none of the listings names a certification mark. Where a listing names a mark, we say so in the table; where we could not find it in a registry, we say that instead.
The 5 products on this page checked against all 5,317 US NSF, USP and Informed Sport listings, 2026-08-25. Full method and limitations.
What Vitamin K2 labels show
Priced per day, these vitamin K2 products run $0.07 to $0.57 — a 8.1× gap between the cheapest and dearest vitamin K2 here, across 4 brands.
Servings here are close enough to compare directly, so the gap is a real one: Nutricost at $0.07 states about the same dose per serving as Sports Research at $0.57.
Our Picks
Best Value: Nutricost Vitamin K2 MK-7 100 mcg
100mcg per 1 softgel. $0.07/day. 240 servings per container at $17.95.
Quality Pick: NOW Foods MK-7 Vitamin K2 100 mcg
100mcg per 1 capsule. $0.22/day. 60 servings per container at $13.46.
Dose check · Vitamin K2
2 of these 5 put more than the studied Vitamin K2 dose in one capsule
2 products on this page put more than 200 mcg, the top of the studied range, in a single capsule: Life Extension Super K; NOW Foods Vitamin K2 (MK-7) 300 mcg. That is not a reason to avoid them, but one capsule gives more than the trials used, so the lowest price per milligram is not automatically the best buy.
The label trap on Vitamin K2: MK-7 and MK-4 doses are not interchangeable; most everyday supplements use MK-7. Critical: opposes warfarin — do not start/stop/change without a doctor managing it
Method: studied range from our own Vitamin K2 dosage guide (PMID 23525894), checked against the 5 products above that state a dose — capsules in whole servings, powders in fractions. Trial doses, not a prescription.
The shelf · Vitamin K2
Pack sizes differ 8×, so the shelf price tells you very little
Sports Research Vitamin D3 + K2 holds 30 servings and Nutricost Vitamin K2 MK-7 100 mcg holds 240: the same shelf price buys 8× more of one than the other, which is why all 5 rows above are priced per day. On that basis Nutricost Vitamin K2 MK-7 100 mcg is the cheapest at $0.07 and Sports Research Vitamin D3 + K2 the dearest at $0.57.
Method: the 5 Vitamin K2 products above, compared on label facts, serving size, servings per container, form, price. Not a dosing recommendation.
How these 5 Vitamin K2 (MK-7) products were ranked
Not one of these 5 vitamin K2 products could be confirmed in the NSF, USP or Informed Sport registries, so verification separates none of them and the ranking falls to cost per day at the labelled serving. Commission does not enter it: the rate is the same whichever vitamin K2 you buy. Full methodology.