Reviews reflect general Jarrow Formulas brand confidence; no MK-7 specific feedback found—sentiment inferred from brand-level mentions.
Jarrow Formulas MK-7 delivers 180 mcg of menaquinone-7, the long-chain form of Vitamin K2 derived from natto fermentation, known for its extended half-life and bioavailability compared to shorter-chain K2 forms. It supports calcium utilization, bone matrix formation, and cardiovascular health by activating K2-dependent proteins like osteocalcin and matrix GLA protein.
Why It's Worth Considering: At 180 mcg per serving, this is a clinically relevant dose of MK-7 in a form that remains active in the body longer than MK-4, making it a practical option for once-daily dosing.
Vitamin K1 (phylloquinone) is for blood clotting — abundant in leafy greens. Vitamin K2 (menaquinone) directs calcium metabolism — puts calcium in bones and keeps it out of arteries. Most people get enough K1 from diet but are deficient in K2, which is found mainly in fermented foods (natto, certain cheeses) and animal liver.
MK-7 is the most bioavailable and longest-acting form of K2, with a half-life of ~3 days (vs ~1 hour for MK-4). This means a single daily dose maintains therapeutic blood levels 24/7. MK-7 is derived from natto (fermented soybeans) and has the strongest clinical evidence for bone density and arterial health.
For general health with D3: 100-200mcg MK-7 daily. For osteoporosis: 180-360mcg. For cardiovascular calcification prevention: 180-200mcg. The dose should scale with your D3 intake — higher D3 doses require more K2 to handle the increased calcium absorption.
If you're on warfarin/Coumadin: NO — K2 counteracts warfarin and will destabilize your INR. Consult your cardiologist. If you're on newer anticoagulants (Eliquis/apixaban, Xarelto/rivaroxaban, Pradaxa/dabigatran): these are NOT vitamin K-dependent, so K2 is safe. Always confirm with your prescribing physician.
Ask Gabriel for personalized stacking recommendations.
No significant interactions identified. Always consult your healthcare provider.
† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
