There is no single “best” form; it depends on goals and context. For basic clotting needs, K1 from leafy greens is highly relevant and typically sufficient. For bone/vascular research, K2 (often MK-7) is discussed because some studies report effects on biomarkers related to protein activation (e.g., MGP). This does not mean K2 is always superior. Best practice: ensure adequate dietary intake first, then consider supplements only for clear clinical reasons and with medical guidance—especially if using anticoagulants.