Also known as: menaquinone-7, MK-7, K2, vitamin K2
Latest evidence update: 2026-12-13
Strongest in Sample size (95). Held back by Recency (26).
Solid mix of RCTs with some methodological gaps.
Confirmed across many independent studies with significant findings.
Tens of thousands of participants pooled across studies.
Mostly aligned, with some divergence.
Mostly pre-2020 research; updates may be needed.
Effect-size tagged on 395 of 400 claims for this supplement. Our research updates daily; remaining claims are pending re-processing.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
Fermented milk may help your body absorb vitamin K2 and other fat-soluble vitamins more effectively when taken together
Vitamin K2 supplementation may support muscle recovery after intense resistance exercise
Recommended: 100-200mcg daily
Vitamin K2 (MK-7) is a form of Vitamin K. The studies above are specifically about Vitamin K2 (MK-7); broader vitamin k research differs in dose and bioavailability and lives on the parent page.
See all Vitamin Kresearch →ProtocolEngine provides general health information based on published research. This is not medical advice. Consult a healthcare professional before starting any supplement or health protocol.