Short answer: Vitamin K2 (Menaquinone) is studied for directing calcium toward bone rather than arterial walls, relevant to long-term vascular health.
Why "directing calcium" is a specific, checkable mechanism
This names a precise biological process — distinct from a vague "supports bone and heart health" claim, giving you something concrete to research further.
Why this ingredient addresses long-term, not immediate, vascular health
Addresses long-term vascular flexibility, not just short-term blood flow — a genuinely different timeframe than the formula's more immediate nitric-oxide-focused ingredients.
💡 Worth knowing: arterial health support is listed directly among the formula's six stated supporting roles, tied specifically to this ingredient.