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Individuals have different body types and appropriate injection sites so that the appropriate length will vary
That process is slow, and for some people it is not very efficient
Initially, a person may need B12 supplementation shots every day for around two weeks or until symptoms improve
Intramuscular injections of B12 are administered during the first stage of the test, an hour after the patient takes an oral dose of radiolabeled vitamin B12
doi:10.1038/s41598-021-03670-5
So, why take methylcobalamin if the body can convert other forms to it even in the presence of MTHFR mutations
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