It is a biologically active fraction of vitamin B 12 that can be readily taken up by all cells and represents only 6% to 20% of total serum vitamin B 12 .23 In vitamin B 12 deficiency, serum level of holotranscobalamin decreases even before elevation in homocysteine and MMA levels occurs.24 It has been shown that holotranscobalamin is the most sensitive marker for vitamin B 12 deficiency, followed by MMA.23 25 Like homocysteine and MMA, holotranscobalamin cannot be tested in renal patients as its level increases in renal impairment.23 Furthermore, higher cost and lesser availability than homocysteine and MMA testing make it difficult to acquire wide clinical acceptance
doi: 10.1016/j.pnpbp.2006.06.013
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In fertility and early embryonic development studies, male and female rats were administered twice weekly subcutaneous doses of 0.5, 1.5, or 3 mg/kg (0.3-, 1-, and 2-fold and 0.3-, 0.9-, and 2-fold, respectively, the MRHD of 15 mg once weekly based on AUC)
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