Vitamin K is essential for the proper formation and full activation of the Gla proteins. The Gla protein osteocalcin, when fully carboxylated by vitamin K, allows for the binding of calcium to the bone matrix. The Gla protein known as matrix-Gla protein is found in vascular smooth muscles. Matrix Gla protein is a key inhibitor of soft tissue calcification that binds calcium, preventing it from depositing in the vessel walls.
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Source: Top 10 Foods High in Vitamin K