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You could contact your local CCG/Health Board and ask what guidelines on B12 treatment are currently being used in your area of UK

The activity of NF- B is tightly regulated at multiple levels, a factor that may be associated with its influence on the expression of numerous genes [199]

The diagnosis of vitamin B12 deficiency typically relies on low total B12 levels and elevated concentrations of homocysteine (Hcy), as well as levels of transcobalamin-bound B12 (holoTC) and methylmalonic acid (MMA), which serve as functional indicators of cobalamin insufficiency (Carmel and Sarrai, 2006)
It aids in the formation of DNA and red blood cells that carry oxygen throughout your body
