Though those are nearly always elevated in cases of B12 deficiency, there are rare cases of severe B12 deficiency manifesting with normal B12 levels in the blood, normal MMA levels, and normal homocysteine
Remember also that "normal" is different in different countries -- not just the different labs, but the definition of what constitutes normal
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For oral B12 supplementation with a supplement like Cobalequin, 250 micrograms must be given once daily and continued initially for 12 weeks
On top of that, multiple doses can be administered if needed
Vitamin B12 has important functions in nerves, including (1) promoting nerve regeneration: studies have shown that vitamin B12 can help nerve regeneration by inducing axon growth and differentiation of glial cells, thereby improving the difficult nerve healing caused by compression