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The vitamin is injected directly into muscle (intramuscular) or under the skin (subcutaneous) and is released gradually into the bloodstream
A deficiency can also result from not getting enough B12 in what you eat due to various food restrictions
This enzyme is involved in the conversion of the amino acid homocysteine into methionine which is, in turn, required for DNA methylation
Methylcobalamin is generally considered the fastest acting because it is already in an active form and does not require conversion
By adjusting the dosage based on individual needs, doctors can help patients with vitamin B12 deficiency get the best results
When someone is genuinely deficient, they may notice improvement in energy or mental clarity within a few days, though this varies from person to person and is most likely in people who were low to begin with
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