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The short answerit can vary by individual, but many people begin feeling noticeable effects within hours or days
NICE guidance recommends 1 mg hydroxocobalamin three times weekly for 2 weeks for patients without neurological symptoms, with lifelong maintenance therapy for irreversible causes
How to Inject Vitamin B12 The injection method varies, depending on whether you are injecting B12 under the skin or directly into the muscle
But not everyone reacts the same way
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