1. A form of vitamin K produced by bacteria, especially in the intestines, that plays a role in blood clotting and bone metabolism.
Usage: biochemistry; also called vitamin K2

Examples

• Menaquinone is synthesized by gut bacteria and contributes to the body's vitamin K supply.
• The body can obtain menaquinone from fermented foods and certain dairy products.
• Researchers study menaquinone's role in cardiovascular and bone health.
• Unlike phylloquinone, menaquinone is produced endogenously by intestinal microbiota.
• Menaquinone levels may be important for maintaining proper blood coagulation.