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what level of b12 requires injections Oral vs. Intramuscular Vitamin in Vitamin B12 Deficiency • The Blood Project Vitamin B12 Deficiency: Recognition and
Description
doi: 10.1096/fj.10-171579 60 ProvenzanoPPAlejandro-OsorioALGrorudKWMartinezDAVailasACGrindelandREet al

It is crucial for: Red Blood Cell Production: Vitamin B12 helps produce red blood cells, preventing anaemia and promoting oxygen transport throughout the body

They can be injected into the muscle, usually in the arm or buttock

however, the support for that is weak

Alternative to supplementation of precursors, as described in the NAD + and precursors supplementation section, it is possible to administer NAD + itself through intravenous infusions 66,116,117