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While a blood test is the definitive way to diagnose a clinical deficiency, it isnt always required to start B12 injections for general wellness purposes

Finally, vitamin B12 is crucial for the biochemistry of the nervous system, participating in DNA synthesis, methionine synthesis, methylation reactions, myelin synthesis, and neurotransmitter production (20, 25, 27, 42, 70, 73, 77)

2013: Page No 611 US Food and Drug Administration (FDA) [Internet]

Here's what that window actually means in practice: Days 114: Full preservative effectiveness

Have you heard the hype about vitamin B12 shots for increasing metabolism and losing weight