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Allergic Reactions In rare cases, some people may have a severe allergic reaction to ingredients in the B12 shot
Frontiers in medicine, 3, 38
This keeps out air, dust, and other potential contaminants
Where is the Best Place to Inject B12 Yourself
Inadequate B12 has been associated with degeneration of neurons and atrophy of your brains gray matter, which is critical for information processing
Most side effects typically subside within a few weeks
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