can i take b12 tablets as well as injections Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12 injections for MTHFR:

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Oral administration is not viablegastric acid and hepatic first-pass metabolism degrade peptide bonds within minutes, rendering the compounds inactive before reaching systemic circulation

Administration to animals with a seriously impaired renal and/or hepatic function or with blood dyscrasias

The severity and duration of deficiency are primary determinantspatients with mild, recently developed deficiency typically respond more rapidly than those with longstanding, severe depletion

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