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Some research-community sources argue this creates a higher local concentration in the injected muscle

No Reclassification Has Happened, Yet

Some people may require more frequent doses to maintain levels of B12 or amino acids, while others may find that less frequent injections are sufficient

Kragelund, L., Hosbond, C

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The injection is given every six months if due to a dietary deficiency, or two to three months if the cause of your low B12 levels is pernicious anaemia (an autoimmune condition that can cause a deficiency)