Purely-K — three forms of vitamin K, with the amounts stated
K1 plus both common K2 forms, at published amounts. Unusual on both counts — and a high-dose preparation that interacts with anticoagulants.
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What it is
A vitamin K supplement containing three forms: K1 (phytomenadione), sourced from evening primrose, and both of the common K2 menaquinones — MK-4 and MK-7.
Why people consider it
Vitamin K is one of the fat-soluble vitamins, and it comes in forms that behave differently enough that “vitamin K” on a label is not a complete description.
K1 is the plant form, the one in leafy greens. K2 is the form found in animal foods and fermented foods, and it exists as several menaquinones, of which MK-4 and MK-7 are the two you will meet on a shelf. MK-4 is the form in animal foods; MK-7 comes from fermentation and has a substantially longer half-life, which is why products built on it are usually dosed less often.
Most supplements pick one — nearly always MK-7 alone. People who have read into the topic often want more than one form, and that is what brings them to a product like this.
What makes this one worth a look
Two things, and the second is the one we did not expect to write.
It contains all three forms, which is a genuine formulation difference rather than a marketing one.
It publishes the amounts. 1000 mcg of K1 per capsule; 2000 mcg of MK-4 per serving. Across this catalogue, published amounts are the exception — several products name their ingredients and stop there. This one gives you numbers you can compare, add up, and take to a clinician.
That is worth saying plainly, because it is the difference between a supplement you can evaluate and one you have to take on trust. It also means the honest caveats here are specific: the MK-7 amount is missing, and K1 is quoted per capsule while MK-4 is quoted per serving without the two being reconciled.
Key facts
| Price | $50 when last checked — not confirmed as current |
|---|---|
| Count | 30 per bottle |
| Cost per unit | Not quoted — depends on the current price, which we have not confirmed |
| Serving size | Stated per capsule for K1; the full panel serving size is not published |
| Contains | Vitamin K1 (phytomenadione), 1000 mcg per capsule · Vitamin K2 as MK-4, 2000 mcg per serving · Vitamin K2 as MK-7 |
| Sourcing | K1 sourced from evening primrose (manufacturer statement). |
| Certificate of analysis | Not published |
| Availability | In stock when checked on 2026-09-04 — that reading is now out of date |
Who it may suit
- You specifically want MK-4 and MK-7 together rather than MK-7 alone, which is what most K2 products supply.
- You want a product that publishes its amounts — this one does, and most of this catalogue does not.
- You already know why you are taking vitamin K and are choosing between formulations.
Less of a fit if…
- You take warfarin or any other anticoagulant or antiplatelet medication. See the note at the top of this page.
- You want a low, food-equivalent dose. This is a high-dose preparation and it does not pretend otherwise.
- Cost per capsule is a constraint. At $1.67 it is the most expensive supplement per unit in this catalogue.
Worth knowing before you buy
What we verified
9 statements on this page are tiered and traced to a source. Manufacturer statements are labelled as manufacturer statements rather than repeated as findings.
Show the evidence table
Where each claim on this page comes from
Every factual statement above is listed here with its source. Rows marked “manufacturer claim” are the manufacturer’s description of its own product, reported without endorsement.
| Tier | Claim | Kind | Source |
|---|---|---|---|
| E | The adult adequate intake for vitamin K is 120 mcg per day for men and 90 mcg per day for women. | External source | NIH Office of Dietary Supplements, Vitamin K fact sheet for health professionals |
| E | Menaquinone-7 has a substantially longer half-life in circulation than menaquinone-4. | External source | Peer-reviewed pharmacokinetic comparisons of menaquinone forms
Population: Healthy adults in pharmacokinetic studies; the page describes the finding as pharmacokinetic |
| E | Vitamin K antagonist anticoagulants act by opposing vitamin K, and vitamin K intake can affect their control. | External source | NIH Office of Dietary Supplements, Vitamin K fact sheet for health professionals |
| B | The product is a single 30-capsule variant priced at $50.00 and available at the 2026-09-04 inventory check. | Specification | MitoLife storefront inventory endpoint, retrieved 2026-09-04 |
| B | At $50 for 30 capsules the unit cost is $1.67 per capsule, the highest unit price of any supplement in the catalogue. | Specification | Arithmetic across all catalogue prices verified 2026-09-04 |
| B | The listing states K1 content per capsule and MK-4 content per serving without reconciling the two, and does not publish a serving size for the full panel. | Specification | MitoLife storefront inventory endpoint, retrieved 2026-09-04 |
| A | The manufacturer publishes 1000 mcg of vitamin K1 per capsule and 2000 mcg of vitamin K2 as MK-4 per serving, and states that MK-7 is also present without giving an amount. | Manufacturer statement | MitoLife product listing, retrieved 2026-09-04 Manufacturer statement, not independently verified. |
| A | The manufacturer states the K1 is sourced from evening primrose. | Manufacturer statement | MitoLife product listing, retrieved 2026-09-04 Manufacturer statement, not independently verified. |
| F | Our view: publishing the amounts is a genuine point in this product’s favour, and it is what makes the remaining gap in the MK-7 figure specific rather than general. | Our editorial view | Editorial assessment Our view: this is our editorial judgement, not a finding. |
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