how often should i inject b12 You Have Injections? Vitamin B12 Injections Dosage and
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doi: 10.1038/nbt831

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Within the central nervous system, B12 is vital for maintaining the myelin sheath that protects nerve fibres and for methylation processes that support neurological function, indirectly affecting neurotransmitters involved in mood regulation

Other side effects are very rare
If allergic to bugs, avoid areas where there might be lots of them or wear protective clothing