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It still enters circulation, so it is not a true local injection
Do not leave it sitting on the bathroom counter overnight
PMID: 38797248 10 Vitamin B12 deficiency in the elderly: is it worth screening
Many people notice increased energy and focus within a day or two
Rotate injection sites to prevent tissue irritation and induration
Critically, there is no rigorous, comparative research to definitively prove the methods are equally effective or interchangeable
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