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Standard subcutaneous injection in the abdominal area is sufficient
10.1016/j.jpedsurg.2014.11.037 67
Supplementation with L-methylfolate (instead of folic acid) avoids this potential problem and is preferable to folic acid
That means faster, more reliable absorption than oral supplements
People may be deficient in vitamin B12 if they dont eat animal products, or if their body does not absorb it well naturally
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