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Deficiency in B12 can result in symptoms such as trouble concentrating, memory problems, and mood changes
Compound stability characteristics
It can take up to a day to feel the effects of vitamin B12 shots, though some people notice the effects sooner
Clinical guidance for intramuscular injections points to a 22 to 25 gauge needle, given at a 90-degree angle, with the length chosen so it reaches muscle without going too deep
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