Vitamin K2
Research Reliability -
A targeted K2 supplement that directs calcium to bones and teeth while protecting arteries from calcification.
Appetite
Mood
Sleep
Vitamin K2
Description
Vitamin K2 (as MK-7) activates proteins that regulate calcium distribution in the body, ensuring it is deposited in bones rather than accumulating in arteries or soft tissues. This makes it an important cardiovascular protector, especially for those supplementing with higher doses of Vitamin D or calcium. It supports bone mineral density, reduces fracture risk, and may contribute to arterial flexibility. Most people do not get adequate K2 from diet alone, as it is found primarily in fermented foods like natto.
Effects
First weeks
nothing felt
Weeks to months
calcium gets directed toward bone, away from arteries
Long term
this is a decades-scale insurance play
How it Feels
There is no sensation to K2. It is one of the purest examples of a supplement you take for what happens in your arteries and bones, not for how you feel. Trust the mechanism, not your body.
Usage
Commonly Referenced Starting Amount
90 mcg/day (MK-7)
Commonly Referenced Amount
90–360 mcg/day covers the range used in MK-7 bone and cardiovascular trials
Referenced Upper Limit
No upper limit has been established. Important interaction: K2 can blunt warfarin's anticoagulant effect
Onset
Weeks–months (bone/artery)
Combinations
Pairs well with
Synergistic
Vitamin D3 — D3 increases calcium absorption; K2 directs it to bone not arteries
Magnesium — activates K2-dependent enzymes; supports osteocalcin carboxylation
Omega-3 — combined cardiovascular protection via complementary mechanisms
Avoid combining
Contraindicated
General research note: some studies discuss factors that may influence how this nutrient is absorbed or used by the body. This is educational information only, not medical advice — consult a qualified healthcare provider for guidance specific to you.
Biomarkers to Track
Subjective
(Daily)
Joint comfort and stiffness
Dental health observations
Bruising frequency
Objective
(Quarterly)
Osteocalcin (bone turnover marker)
dp-ucMGP (arterial calcification)
Bone density scan (DEXA)
Very safe on its own. Its effect on clotting is the one real interaction.
Anyone on warfarin or similar anticoagulants, without doctor coordination.
Taking it without vitamin D, and giving up because you cannot feel it working.
Moderate (some human RCTs)
Bone-density evidence is reasonably solid; cardiovascular/arterial-calcification claims are more preliminary.
Knapen MHJ et al. (2013). Osteoporosis International. RCT (MK-7, bone mineral density). PMID: 23525894.