it would thus appear that the vitamin regimen studied , including 2 micrograms of cyanocobalamin per 24 hr , is able to maintain the s-cobalamine concentration within the reference range during 6 to 8 weeks of tpn in cd patients with no evidence of vitamin b12 deficiency , and to prevent the development of vitamin b12 deficiency during 2 to 4 weeks of tpn in cd patients with a s-cobalamine level initially below 300 pmol/liter .
C0042845
cobalamine
C0042847
of vitamin