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Vitamin K2 Complex

Also sold as: Vitamin K2 MK7, Menaquinone-7

Best-in-class: 3-K Complete

Vitamins✅ Clinically validated📊 Correlative data🧪 Theoretical

Thorne Vitamin K, the product Thorne sold for years as 3-K Complete. The filed panel declares 6,090 mcg of vitamin K per capsule in three forms: K1 1 mg, K2 as menaquinone-4 5 mg and K2 as menaquinone-7 90 mcg. There is no vitamin D and no calcium in this bottle — it is the partner to those, not a substitute, and what vitamin K does is activate osteocalcin and matrix Gla protein so the calcium you get elsewhere is directed into bone.

Educational use only — not medical advice. These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.

Vitamin K2 Complex quick facts

Suggested doseOne capsule, once or twice daily, with a meal containing fat.
How oftenDaily
Who it's forBone density and arterial calcification — the reason a K supplement gets added to a bone protocol.
Coach Cam’s take

The partner vitamin D needs, and the reason high-dose D on its own is not obviously benign — D increases calcium absorption, and without adequate K2 there is nothing directing that calcium away from your arteries. The Rotterdam cohort linked higher K2 intake to substantially lower arterial calcification and cardiac mortality. The real interaction is warfarin, which works by blocking exactly this enzyme: anyone on it needs consistent vitamin K intake, not zero, and needs to tell their prescriber.

How Vitamin K2 Complex actually works

Vitamin K is the cofactor for gamma-glutamyl carboxylase, the enzyme that adds a carboxyl group to specific glutamate residues on a handful of proteins — and that carboxylation is what lets those proteins bind calcium. Two matter here. Osteocalcin, once carboxylated, deposits calcium into bone matrix. Matrix Gla protein, once carboxylated, actively inhibits calcification in arterial walls. So K2 is the traffic director deciding where calcium ends up. MK-4 has a half-life of hours and needs frequent dosing; MK-7 lasts days.

⚠️ Good to know: Anyone taking warfarin must not start this without their prescriber: vitamin K is the antidote to that drug and moves the INR.
⏱ Timing that matters for safety: Directly antagonizes warfarin

Where to get Vitamin K2 Complex

Buy 3-K Complete at Thorne →
10% off auto-applied at checkout · Coach Cam partner link

The evidence for Vitamin K2 Complex

Graded by what exists behind each claim.

✅ Clinically validated

📊 Correlative data

🧪 Theoretical / extrapolated benefits

How to read these tiers: they say how much human evidence exists, not how well something works — and ✗ flags harm, never a disappointing trial. How the evidence tiers work →

What Vitamin K2 Complex actually does

Vitamin K does one chemical thing, and everything else on this page follows from it. Gamma-glutamyl carboxylase converts specific glutamate residues into gamma-carboxyglutamate, and only the carboxylated protein can bind calcium. Two of its substrates matter here: osteocalcin, which is made by osteoblasts, and matrix Gla protein, which is made in the vessel wall and inhibits calcification there Hariri 2021.

The carboxylase runs on a cycle, and the cycle is what determines how often you have to feed it. Each carboxylation oxidizes vitamin K hydroquinone to the epoxide, and vitamin K epoxide reductase regenerates it. That recycling is why the daily requirement is small; it is also the enzyme warfarin blocks, which is why this vitamin has the sharpest drug interaction on the site Jadhav 2022.

The forms in this bottle have half-lives that differ by an order of magnitude, and that is the entire form argument. The panel filed for Thorne Vitamin K under DSLD 328817 declares three: vitamin K1 at 1 mg, menaquinone-4 at 5 mg and menaquinone-7 at 90 mcg per capsule Office of Dietary Supplements. Phylloquinone and menaquinone-4 are cleared in hours; menaquinone-7 carries a long isoprenoid tail, rides lipoproteins, and persists for days. Which is why 90 mcg of one and 5 mg of the other can be the right ratio: the small number stays.

And the substrate itself is on a daily rhythm nobody accounts for. Serum osteocalcin has a documented diurnal rhythm, measured against 24-hour integrated concentrations and examined for age, sex, season and smoking Nielsen 1990, and separately related to sleep, growth hormone and parathyroid hormone Nielsen 1991. A single morning osteocalcin is a point on a curve, which matters for anybody using it to judge whether a vitamin K product is working.

Cell, rodent, human — and where it stops

The biochemistry is settled, the surrogate moves, and the hard endpoint is where the chain thins out.

What has been measured in people. A randomized clinical trial of menaquinone-7 supplementation in type 2 diabetes reported dephospho-uncarboxylated matrix Gla protein, protein induced by vitamin K absence or antagonist-II, inflammatory markers and body composition Karamzad 2022. A systematic review and meta-analysis of randomized controlled trials examined vitamin K supplementation and vascular calcification Li 2023. A separate meta-analysis covered dialysis patients specifically, the population with the most calcification to lose Andrian 2023. And a pilot study compared menaquinone-7 tablets against a vitamin K-rich diet for correcting deficiency in hemodialysis Lentz 2022.

The obstacle is the distance between the marker and the outcome. Dephospho-uncarboxylated matrix Gla protein is a functional vitamin K status marker and it responds to dosing Karamzad 2022 Lentz 2022. Whether driving that marker down changes calcification progression is the question the meta-analyses were assembled to answer, and they answer it cautiously Li 2023 Andrian 2023.

The second obstacle is time. Vascular calcification changes over years and trials run for months. A null result at 12 months in a calcification endpoint is a statement about 12 months, and the reviews of vitamin K2 in cardiovascular health say so explicitly Hariri 2021.

What would close the gap. Report carboxylation status and the imaging endpoint in the same participants over several years, and separate the forms rather than pooling any menaquinone with any other Jadhav 2022.

Vitamin K2 Complex — which form, and does it matter

This is a page where the form section is arithmetic, and the arithmetic is on a filed label. The DSLD record for Thorne Vitamin K, number 328817, declares vitamin K1 1 mg, menaquinone-4 5 mg and menaquinone-7 90 mcg per capsule Office of Dietary Supplements. Three forms, three pharmacokinetic profiles, one capsule. There is no vitamin D and no calcium in it, which the same record makes explicit.

Menaquinone-4 at 5 mg looks enormous next to menaquinone-7 at 90 mcg, and that is not a mistake. The Japanese bone literature used menaquinone-4 at 45 mg a day in three divided doses precisely because it does not persist; the compound is cleared in hours Jadhav 2022. Menaquinone-7 has a long half-life, so a microgram dose given once daily maintains a level a milligram dose of the short form cannot Karamzad 2022.

Which means dose frequency is a form decision. A menaquinone-4 product taken once a day spends most of the day at a trough. A menaquinone-7 product taken once a day does not. Two bottles labeled 'vitamin K2' with the same milligrams are not the same intervention, and no panel is required to say which one you have beyond naming the form Jadhav 2022.

All of it needs fat. These are fat-soluble vitamins absorbed in chylomicrons, so a capsule taken with black coffee is a capsule taken at a disadvantage. Whole-diet approaches perform differently from tablets in part for that reason, which the hemodialysis comparison examined directly Lentz 2022.

What would have to be true, and how you would know it was not

1. The carboxylation prediction, at 12 weeks. Dephospho-uncarboxylated matrix Gla protein at baseline and 12 weeks. Predict a substantial fall on a menaquinone-7-containing product Karamzad 2022 Lentz 2022. This is the marker that tells you the vitamin arrived and the enzyme used it.

2. The osteocalcin timing prediction, which is a measurement warning. Draw osteocalcin at the same clock hour both times. Predict that comparing an 8 a.m. sample with a 4 p.m. sample produces a difference larger than the supplement's, because the diurnal rhythm is documented Nielsen 1990 Nielsen 1991.

3. The form-frequency prediction. Same total menaquinone-4, once daily for 6 weeks and split three times daily for 6 weeks, with carboxylation status measured at the end of each. Predict the split schedule wins, because the short half-life is what the divided dosing in the original bone trials was for Jadhav 2022.

4. The prediction that cuts against the category. A calcification imaging endpoint at baseline and 12 months. Predict no detectable change in an individual over that horizon, because the meta-analyzed trials are cautious at that timescale Li 2023 Andrian 2023. Anyone promising visible artery change in a year is promising past the evidence.

5. The anticoagulation prediction, and it is a stop rather than an experiment. In anyone on warfarin, predict a measurable INR change when vitamin K intake changes Jadhav 2022. That prediction is the reason this product requires a prescriber conversation before the first capsule and not after.

What nobody has tested yet

Nobody has run the three forms head to head. The filed capsule contains K1, menaquinone-4 and menaquinone-7 together Office of Dietary Supplements, and no trial has separated their contributions to carboxylation status or to any clinical endpoint.

Nobody has taken the surrogate to a hard endpoint over a decade. Carboxylation responds Karamzad 2022; calcification trials are short Li 2023 Andrian 2023; fracture and event data at that horizon do not exist for this combination.

Nobody has established a menaquinone-7 dose-response for carboxylation across the range sold. Products range from 45 mcg to 360 mcg and the plateau has not been mapped Jadhav 2022.

And nobody has studied vitamin K supplementation in people on warfarin prospectively enough to give a rule. Consistency of intake is the current advice and it rests on pharmacology rather than on a trial Hariri 2021.

Vitamin K2 Complex — its own safety story, not its category's

Vitamin K has no established toxicity threshold, and it still has the sharpest interaction of anything in this batch. Warfarin works by blocking vitamin K epoxide reductase; vitamin K is its direct antagonist Jadhav 2022. The harm is not from taking it, it is from changing how much you take without telling the person managing the INR. Consistency is the rule.

The direct oral anticoagulants are a different situation. Apixaban and rivaroxaban inhibit factor Xa directly and do not run through the vitamin K cycle, so this interaction does not apply to them. That distinction is worth stating because 'blood thinner' is one word for two unrelated mechanisms Hariri 2021.

The renal population is where the evidence is densest and the decisions are least casual. Dialysis patients have both the most calcification and the most vitamin K deficiency, and both the meta-analysis and the tablet-versus-diet pilot sit in that population Andrian 2023 Lentz 2022. Anyone with kidney disease should be making this decision inside their nephrology care.

What this bottle is not. The filed panel contains no vitamin D, no calcium and no magnesium Office of Dietary Supplements. It directs calcium; it does not supply it, and it does not substitute for the vitamin D that governs absorption. Nothing here is medical advice or a diagnosis, and none of these statements has been evaluated by the Food and Drug Administration.

Sources read for this page

How you would know if it worked

These are the markers this product's own mechanism names, which makes them the ones that would show it working.

The cheapest panel carrying Vitamin D (25-Hydroxy) and at least one other of these is Bone Density & Fracture Risk, at $333 — the panel is named for a different question, and the marker is the same marker. That is the whole cost of finding out.

Draw before you start, not after. A result with nothing to compare it to answers nothing.

Vitamin K2 Complex — safety & side effects

Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.

🔒
The dose is the easy part. Making Vitamin K2 Complex actually work is what's behind Skool:
Running it
  • When to take it, and what to take it with
  • Which form actually absorbs
  • Who it's worth it for
  • Best-in-class brand pick
  • Coach Cam's stacks and notes
When to take it
  • Fasted or with food, and when in the day
  • Morning or night, and why that window
  • Around training, or deliberately away from it
  • What it must not share a window with

Everything above is free and stays free. Skool is where it becomes a plan — Vitamin K2 Complex in an order, with the rest of what you're running.

Unlock in Skool — $10/mo →

Bloodwork to run alongside Vitamin K2 Complex

Baseline first, then again at 8–12 weeks.

MarkerWhat it’s watching for
Parathyroid Hormone & CalciumK2 directs calcium. Only interpretable next to PTH
Vitamin D (25-Hydroxy)The two work together; correcting one alone is half the job
OsteocalcinK2 activates osteocalcin — this is its actual mechanism

The Bone Density & Fracture Risk panel covers these in one order — 8 markers, $299.70 with the discount applied.

Check results you already have → · All 103 markers A–Z

Vitamin K2 Complex — frequently asked questions

What is Vitamin K2 Complex?

Thorne Vitamin K, the product Thorne sold for years as 3-K Complete. The filed panel declares 6,090 mcg of vitamin K per capsule in three forms: K1 1 mg, K2 as menaquinone-4 5 mg and K2 as menaquinone-7 90 mcg. There is no vitamin D and no calcium in this bottle — it is the partner to those, not a substitute, and what vitamin K does is activate osteocalcin and matrix Gla protein so the calcium you get elsewhere is directed into bone.

What is the suggested dose of Vitamin K2 Complex?

One capsule, once or twice daily, with a meal containing fat. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.

Where can I find Vitamin K2 Complex dosing and the full breakdown?

The suggested dose and the full evidence — clinical, correlative and theoretical — are on this page. What's inside Skool is when to take it, which form actually absorbs, the brand worth buying and Coach Cam's stacks.

Where can I buy Vitamin K2 Complex?

Coach Cam sources Vitamin K2 Complex from Thorne, with 10% off auto-applied at checkout — use the buy link on this page.

Vitamin K2 Complex inside a finished plan

One arm of 5 Protocol Blueprints, free to read in full.

The Injury Repair Blueprint12 weeks · Vitamin K2 Complex runs alongside the bone armThe Female Hormone Blueprint16 weeks · Vitamin K2 Complex runs alongside the perimenopause armThe Cardiovascular Blueprint16 weeks · Vitamin K2 Complex runs alongside the residual risk armThe Joints & Bone Blueprint16 weeks · Vitamin K2 Complex runs as the bone armThe Foundations Blueprint12 weeks · Vitamin K2 Complex runs alongside the insurance arm

What Vitamin K2 Complex is used for

Vitamin K2 Complex appears under 6 goals in the goal router.

🩹 Heal an injuryBone & fracture healing⏳ Longevity & healthspanThe unglamorous evidence — what actually has mortality data🌸 Female hormonal balancePerimenopause & the estrogen decline🫀 Heart, cholesterol & blood pressureThrombosis, Lp(a) & residual risk🦴 Joints & boneBone remodeling — building vs preserving🧭 I'm starting from scratchMicronutrient insurance
Vitamin DVitamin CB-ComplexMultivitaminMethylation SupportMethylfolate (5-MTHF)Methylcobalamin (B12)Biotin

Where this goes next

In contextBone & fracture healingThe heal an injury pathway Vitamin K2 Complex belongs to
The full protocol$10/mo

Vitamin K2 Complex is the bone arm of this plan. The page above is the free breakdown of one compound; the plan it belongs to — the dosing, the order to correct things in, the week-by-week schedule and what to retest — is a lesson inside Skool.

The Injury Repair Blueprint

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