It's unusual for
vitamin B12 to be around low 50 pcg and CBC results are shown normal.
At this level you definitely show symptoms of B12 defeciency and blood test abnormalities
I suggest you to repeat cbc and vitamin 12.If confirmed follow the treatment
Next Steps
injections intramuscular(CYANOCOBALAMIN)
1,000 μg/day for 7 days, then
1,000 μg weekly for 4 weeks, then
1,000 μg monthly for life
OR
High-dose, daily oral cyanocobalamin at doses of 1,000 to 2,000 μg are as effective as monthly intramuscular