Add to Cart Compare Quick view Superior Source: Vitamin K-2 500mcg Mk4, 60 Tb Superior Source MSRP: Now: $23.99 Was: Our Instant Dissolve MicroLingual Tablets go to work fast, under the tongue. Vitamin K supports normal blood clotting and the formation of prothrombin. MSRP: Now: $23.99 Was: Add to Cart Compare Quick view