Solgar Vitamin K1 (Phytomenadione) 100µg Tablets contains Vitamin K, a fat-soluble vitamin. There are 3 types of Vitamin K; K1 (Phytomenadione) is derived from food, K2 (Menaquinone) is produced by intestinal bacteria and K3 (Menadione) is a synthetic form. Vitamin K is important for blood clotting or coagulation and is essential for the synthesis by the liver of blood clotting proteins. Vitamin K is also widely recognised for supporting healthy bones. This is due to its ability to activate calcitonin, a hormone produced by humans, which then aids the absorption of Calcium into the bone. Absorption of Vitamin K takes place mainly in the upper part of the small intestine with the help of bile or bile salts and pancreatic juices and then carried to the liver. Vitamin K is found in both plant and animal sources in nature, with high concentrations found in dark leafy greens liver, milk and fish liver oils. Solgar 100mcg Vitamin K1 has a 1 tablet a day dose, providing you with this key vitamin, contributing to: - Normal blood clotting - Maintenance of normal bones All Solgar products meet our industry recognized \"Gold Standard\" for excellence. Made using naturally sourced ingredients and innovating since 1947, Solgar is your perfect supplement to good health - 98% of Solgar consumers recommend the brand