Vitamin K plays a crucial role in blood clotting and bone health, but it exists in two primary forms: Vitamin K1 (Phylloquinone) and Vitamin K2 (Menaquinone). While both contribute to overall health, they differ in biological functions, absorption, food sources, and long-term effects. This article breaks down their key differences and helps you determine which one is best suited for your needs. 1. Understanding the Differences Between Vitamin K1 and K2  Key Characteristics Feature Vitamin K1 (Phylloquinone) Vitamin K2 (Menaquinone) Structure Phylloquinone Menaquinone Primary Sources Leafy greens (spinach, kale, broccoli) Fermented foods (natto, cheese), animal products (egg yolks, poultry) Absorption Primarily used in the liver Distributed throughout the body, especially in bones and blood vessels Main Function Blood clotting Calcium metabolism (bone strength, artery protection) Storage & Half-life Short half-life, used quickly Longer half-life, longer-lasting effects ...