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The single most important framing: efficacy figures for this molecule come from cell and animal studies , so any timeline is a research expectation, not a guaranteed outcome

Feeling Worse After B12 Injections Usually, this phenomenon occurs within the first few weeks of starting with the B12 shots

For each analysis, the statistical test used and n for each group are found in Supplemental Tables 2, 3, or 5

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Sometimes people can take high doses of oral B 12 to provide replacement instead of undergoing injections, but a physician should closely supervise this