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Expected Duration of B12 Injection Benefits The duration of vitamin B12 injection benefits can vary based on individual factors, but in general, the effects of a single injection can last for several weeks to several months
Some people have an easier time making changes with their health and diet, noticing results in their body with in the first week
doi: 10.1177/03635465251357593
If the needle is too short for the person, or the angle is wrong, the dose can end up in subcutaneous fat, where absorption is slower and less predictable
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