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Acute symptoms such as fatigue may improve within days, whilst neurological symptoms like paraesthesia typically require weeks to months of treatment
Since the body doesnt store B12 for long, you should be getting vitamin B12 on a regular basis from one of these sources
B Vitamins and the Brain: Mechanisms, Dose and Efficacy - A Review
You're experiencing any kind of infection
Explore the spectrum of B12 Shots & B12 Injections: The Good, Bad, and Alternative
High doses of B12 may worsen the disease and cause irreversible damage to the optic nerve
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