Vitamin K1

Vitamin K1, also known as phylloquinone, is a fat-soluble vitamin best known for its role in blood coagulation and bone metabolism. It serves as an essential cofactor for enzymes that activate specialized proteins involved in calcium regulation and normal physiological function. Vitamin K1 is found predominantly in green leafy vegetables and plays a critical role in maintaining several important biological systems.

The most recognized function of Vitamin K1 involves blood clotting. Certain proteins responsible for normal coagulation require Vitamin K-dependent activation before they can function properly. This process allows the body to regulate bleeding and support normal wound-healing responses when blood vessels are injured.

Vitamin K1 also contributes to bone health through its role in activating osteocalcin, a protein involved in bone mineralization. Osteocalcin helps regulate the incorporation of calcium into bone tissue, supporting skeletal maintenance and structural integrity. This relationship highlights Vitamin K’s importance beyond its traditional association with clotting.

Additional Vitamin K-dependent proteins participate in calcium regulation throughout the body. These proteins help guide calcium toward appropriate tissues while supporting normal mineral balance. Research continues to explore the broader physiological functions of Vitamin K-dependent pathways.

Green leafy vegetables are among the richest dietary sources of Vitamin K1. Excellent sources include kale, spinach, collard greens, mustard greens, Swiss chard, turnip greens, parsley, broccoli, Brussels sprouts, and other green vegetables. Whole-food plant-based diets typically provide abundant amounts of Vitamin K1 due to their emphasis on leafy greens.

Insufficient Vitamin K intake may impair activation of clotting proteins and affect calcium-regulating pathways. Because Vitamin K-dependent proteins are involved in multiple physiological processes, maintaining adequate intake is important for long-term health.

Vitamin K1 functions as a specialized nutrient that supports normal blood coagulation, bone metabolism, and calcium regulation. Through its activation of key proteins, it helps maintain structural integrity and physiological balance throughout the body. Regular consumption of green leafy vegetables provides abundant Vitamin K1 along with fiber, minerals, antioxidants, and numerous beneficial phytochemicals that contribute to overall health.

Include leafy greens daily. Rotate: romaine → spinach → kale → collards. Pair with avocado, tahini, or seeds to support absorption (fat-soluble).

Phylloquinone is abundant in leafy greens and plant oils. It is incorporated into cell membranes and transported in lipoproteins. The vitamin K cycle allows repeated reuse: phylloquinone → hydroquinone → epoxide → phylloquinone. Tissue distributions depend on dietary intake and lipid absorption.

Data verified from NIH ODS and vitamin K cycle biochemistry. Phylloquinone is the primary form in plant-based diets. CID 5280483 structural identity confirmed via PubChem.