Supplement·Interactions·Reviewed June 9, 2026
Vitamin K2 MK-4 interactions.
Vitamin K2 MK-4 has 9 documented interactions in the NutriStack database: 1 to avoid or watch closely, 1 that need timing or caution, and 7 that work synergistically. The full list, with what each pairing does, is below.
Vitamin K2 MK-4 at a glance.
A quick, data-grounded summary. The full table is below.
Vitamin K2 MK-4 has 9 documented interactions in the NutriStack database: 1 to avoid or watch closely, 1 that need timing or caution, and 7 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with vitamin k2 mk-4.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| Warfarin | Conflict | Vitamin K2 in the MK-4 (menatetrenone) form opposes warfarin in the same way as K1 and K2 MK-7: it restores production of vitamin K-dependent... details → |
| Vitamin E | Caution | High-dose vitamin E may reduce K2-dependent protein carboxylation, potentially affecting both bone and cardiovascular K2 benefits. |
| Calcium | Synergy | K2 activates osteocalcin to direct calcium to bones and matrix GLA protein to prevent arterial calcification. Essential when supplementing calcium. details → |
| Evening Primrose Oil | Synergy | Evening Primrose Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K2 MK-4. |
| Fish Oil | Synergy | K2 (MK-7) is fat-soluble and absorption increases with dietary fat. Fish oil provides an excellent fat vehicle. details → |
| Flaxseed Oil | Synergy | Flaxseed Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K2 MK-4. |
| MCT Oil | Synergy | MCT Oil provides a fat-containing carrier that can improve absorption of fat-soluble compounds like Vitamin K2 MK-4. |
| Vitamin D3 | Synergy | Vitamin D3 increases calcium absorption, while K2 activates osteocalcin and matrix GLA protein to direct calcium into bones and away from arteries. details → |
| Vitamin K1 | Synergy | K1 primarily supports coagulation while K2 (MK-7) directs calcium to bones. Complementary roles in vitamin K metabolism. |
The full vitamin k2 mk-4 profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common vitamin k2 mk-4 questions.
Quick answers drawn from the table above.
What interacts with Vitamin K2 MK-4?
In the NutriStack database, Vitamin K2 MK-4 has 9 documented interactions with other supplements and medications. The most notable include Warfarin, Vitamin E, Calcium, Evening Primrose Oil, and Fish Oil.
What should you not take with Vitamin K2 MK-4?
Vitamin K2 MK-4 is flagged against 1 substance in the database, including Warfarin. Review these with a clinician before combining, especially alongside prescription medications.
What works well with Vitamin K2 MK-4?
Vitamin K2 MK-4 pairs synergistically with Calcium, Evening Primrose Oil, Fish Oil, Flaxseed Oil, and MCT Oil in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take Vitamin K2 MK-4 with Warfarin?
NutriStack classifies the Vitamin K2 MK-4 and Warfarin pairing as conflict: Vitamin K2 in the MK-4 (menatetrenone) form opposes warfarin in the same way as K1 and K2 MK-7: it restores production of vitamin K-dependent clotting factors. MK-4 is... Avoid vitamin K2 MK-4 supplements while taking warfarin unless your prescriber has explicitly approved it. If you cannot avoid it, keep the dose and...
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