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If you take certain medications that interfere with the absorption of B12
296 , jbc.RA120.014682 (2021)
Supplier guidance often suggests using a small amount of a compatible organic solvent (e.g., DMSO or acetonitrile) for initial solubilization, then diluting into water/buffer
In these cases, oral supplements may not be effectively absorbed, making B12 injections a more reliable treatment option
It cannot be reliably used to prevent periods, and Norethisterone must not be added alongside it due to progestogen stacking
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