Absorption & Bioavailability
When it comes to Vitamin K2 supplementation, form selection is one of the most consequential decisions you can make. Different chemical forms of Vitamin K2 vary significantly in how well your body absorbs and uses them — and MK-7 vs MK-4 is one of the most commonly compared pairs.
MK-7 has high absorption compared to MK-4 (good absorption), meaning more of the active compound reaches the bloodstream per dose unit.
MK-7 shows high absorption and is classified as Preferred Form in the FormulaForge formulary. MK-4 shows good absorption and is classified as Secondary Form.
MK-7 (menaquinone-7) has a 3-day biological half-life, ensuring sustained 24-hour protection from a single daily dose. Its long-chain menaquinone structure is preferentially transported to peripheral tissues including arteries and bone, activating both MGP and osteocalcin.
Dosing Comparison
Because forms with lower bioavailability require a larger amount to deliver equivalent absorbed nutrient, dose ranges should not be compared interchangeably between forms without accounting for these differences. Speak with your healthcare provider to determine the appropriate dose for your goals.
Side Effects & Tolerability
Both MK-7 and MK-4 are generally well-tolerated at recommended doses. Always consult a healthcare provider before starting any new supplement, particularly if you have existing health conditions or take medications.
Consult your healthcare provider before starting or changing a supplement regimen. These statements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease.
Who Should Choose MK-7 vs MK-4?
Choose MK-7 if: bioavailability is a priority, you are focused on supporting Cardiovascular function, or you want the form with the strongest formulary evidence.
Choose MK-4 if: your healthcare provider has recommended it for a specific therapeutic goal, or you require a specialist form not covered by the top-ranked preferred option.
Speak with your healthcare provider for personalized guidance. The best Vitamin K2 form for you depends on your individual health goals, existing nutrient status, and the dose your provider recommends.
These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.