Vitamin guide
Vitamin K2
Vitamin K is needed for normal blood clotting and proteins involved in bone metabolism. K2, especially MK-7, is often paired with D3 in bone-health formulas, but medication cautions matter.
Context-dependentNormal blood clottingBone-protein activationBone-health routines with D3 and calcium context
Supports
- Normal blood clotting
- Bone-protein activation
- Bone-health routines with D3 and calcium context
Best for
- Bone-health formulas
- Adults comparing D3-only versus D3+K2 products
- Users with low fermented-food intake
Cautions
- People on warfarin or other vitamin K-sensitive anticoagulants should not change vitamin K intake without clinician guidance.
- Do not position K2 as a heart-disease treatment.
Food Sources
Natto
Fermented foods
Cheese
Egg yolk
Meat in smaller amounts
Supplement Forms
MK-7 menaquinone-7
MK-4 menaquinone-4
Vitamin K1 phylloquinone
Timing
Usually taken with a fat-containing meal, often alongside vitamin D3.
Interactions To Check
Warfarin and other vitamin K antagonists
FAQs
Why is K2 paired with D3?
D3 supports calcium absorption, while vitamin K-dependent proteins are involved in bone metabolism. Pairing is common, but it does not remove the need for diet and strength training.
Who should avoid K2?
People using warfarin or similar anticoagulants should consult their clinician before changing vitamin K intake.