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In short, an injection will provide a higher dose of B12 at regular intervals, whilst oral supplements have a lower dosage and can be taken every day
Clin Pharmacol Ther 64(2):133143 Granfors MT, Backman JT, Laitila J, Neuvonen PJ (2005) Oral contraceptives containing ethinyl estradiol and gestodene markedly increase plasma concentrations and effects of tizanidine by inhibiting cytochrome P450 1A2
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Bilgicer B et al
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