Nyere undersøgelser har vist, at der fordres vitamin K til biosyntesen al' en række andre proteiner, som indeholder g-karhoxyglutaminsyre, herunder især af' osteocalcin i knoglerne3
More recent work has shown that a number of other proteins containing γ-carboxyglutamic acid require vitamin K for their biosynthesis, notably osteocalcin in bone3.