to evaluate urinary gla excretion , a marker of vitamin k metabolism , the effect of an oral calcium load was studied in 8 volunteers under three conditions : ( 1 ) after 1.5 g elementary calcium ( calcium carbonate ) , ( 2 ) after 1.5 g calcium ( ossopan , a preparation containing 1 mg osteocalcin per g ) and ( 3 ) after 1.5 g calcium but with pretreatment of 10 mg vitamin k1 orally for 3 days .
C0006681
calcium carbonate
C0006675
calcium