If you have been feeling run down, the useful first move is to find out whether B12 is actually the issue
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NICE Clinical Knowledge Summaries and British Society for Haematology guidelines support B12 supplementation in these clinical contexts, with treatment regimens tailored to the underlying cause

The frequency of B12 injections depends on the reason they are prescribed, lab results, and individual response. For documented deficiency, protocols commonly start with more frequent injections (for example, weekly) and then taper to monthly or every 23 months once levels and symptoms stabilize. Some wellness clinics suggest injections every 24 weeks for individuals seeking maintenance of energy levels and mood, provided there is no contraindication and the plan is overseen by a healthcare provider. Regardless of the schedule, ongoing monitoring for symptoms and, when appropriate, periodic blood tests are important to ensure safe and effective supplementation. Benefits of Vitamin B12 Injections B12 injections have a long history of use and are considered safe and effective for treating deficiency when administered correctly. By bypassing the digestive tract and entering the bloodstream directly, injections can quickly increase B12 availability to cells throughout the body. B12 injections can also improve cognitive function and reduce the risk of neurodegenerative diseases

Here is what matters: aim the needle at the glass wall of the vial, not directly at the lyophilized powder cake at the bottom
Among these illnesses are Alzheimers, multiple sclerosis, Bells palsy, neuropathies, Crohns, even autism