The Bone & Arterial Longevity Protocol — D3 + K2 + Magnesium + Boron
A four-part foundation protocol built around one idea: getting calcium into bone and out of arteries. Vitamin D3 drives calcium absorption, vitamin K2 (MK-7) routes it — into the bone matrix via osteocalcin, away from arterial walls via matrix Gla protein. Magnesium is the required cofactor that activates vitamin D, and boron extends its half-life. Dosing, timing, the warfarin warning, and why blood levels beat fixed doses.
Daily Schedule
Timing and dosage for each step
With the largest fatty meal of the day
100 mcg
2000–4000 IU (50–100 mcg). The absorption driver: raises calcium uptake and corrects deficiency. Dose to a 25(OH)D of 30–50 ng/mL, not a fixed pill count — retest at 8–12 weeks. Fat-soluble, so it needs the fatty meal.
Same fatty meal, alongside D3
180 mcg
180 mcg MK-7. The traffic controller: activates osteocalcin (calcium into bone) and matrix Gla protein (calcium out of arteries). This is why D3 and K2 belong together. ⚠️ Do NOT take with warfarin without prescriber management.
Evening with food
2000 mg
~2 g threonate form (≈144 mg elemental Mg). The required cofactor for vitamin D activation — supplementing D3 while magnesium-deficient blunts the response. Evening timing suits its calming profile; any well-absorbed form (glycinate, citrate) works for the cofactor role.
Morning with food
6 mg
3–10 mg elemental. Optional fourth layer: extends vitamin D half-life and enhances conversion to the active form, and most Western diets supply only 1–3 mg. Low cost, wide safety margin.
Protocol Overview
Calcium is the same molecule whether it strengthens a vertebra or stiffens an artery. What differs is where it ends up — and this protocol is built to control that destination.
- Vitamin D3 drives calcium absorption from the gut (grade A for correcting deficiency).
- Vitamin K2 (MK-7) routes that calcium — into bone via osteocalcin, out of arteries via matrix Gla protein (grade B).
- Magnesium is the required cofactor that activates vitamin D in the first place.
- Boron extends vitamin D's half-life — an optional low-cost fourth layer.
The full reasoning is laid out in The Bone & Arterial Health Stack article.
Dosing Summary
| Role | Supplement | Dose | Timing | Evidence |
|---|---|---|---|---|
| Absorb | Vitamin D3 | 2000–4000 IU | Fatty meal | A (deficiency) |
| Route | Vitamin K2 (MK-7) | 180 mcg | With D3 | B |
| Activate | Magnesium | ~144 mg elemental | Evening | B |
| Extend | Boron | 3–10 mg | Morning | C |
D3 and K2 share one fatty meal. Magnesium is separated to the evening for its calming effect; boron sits with breakfast.
How to Build It
Do not start everything at once — add in the order that matters most.
- Weeks 1–8: D3 + K2 together. This is the core pairing and the reason the protocol exists. Take both with the day's fattiest meal.
- Add magnesium if you are not already supplementing it. Most people under-consume it, and it is the cofactor that makes the D3 work — this is a high-value addition, not an afterthought.
- Add boron last, with breakfast, as the optional half-life extender.
- Retest 25(OH)D at 8–12 weeks and adjust the D3 dose to land in the 30–50 ng/mL range.
Dose to a Blood Level, Not a Number
The biggest mistake with this stack is picking a vitamin D dose and never checking it. Requirements vary with body weight, baseline status, skin, latitude, and sun exposure. Test 25(OH)D, target 30–50 ng/mL, retest, adjust. For the full dosing logic see the vitamin D article.
Safety & Notes
- Warfarin: vitamin K2 directly opposes warfarin and can destabilise INR. Do not add K2 on warfarin without your prescriber managing it. DOACs (apixaban, rivaroxaban) are not affected.
- Vitamin D ceiling: stay at or below ~4000 IU/day unless a clinician is guiding correction of a documented deficiency. Toxicity requires sustained very high intake; more is not better once replete.
- Hypercalcaemia risk conditions: sarcoidosis, primary hyperparathyroidism, and a history of calcium kidney stones warrant medical guidance before high-dose D3.
- This is a wellness protocol, not treatment for osteoporosis or vascular disease. Diagnosed conditions belong with a clinician.
Foundations First
Supplements are the margin. Resistance training loads bone directly and does more for bone density than any capsule; blood-pressure and metabolic control protect the arterial wall the K2 is meant to guard. Treat this stack as the nutritional layer on top of those, not a substitute for them.