What to take for a possible deficiency? Does this depletion include muscle weakness? Are canker sores a symptom of not enough B-12? I wonder if B-12 is checked in a normal CBC test?
There's many causes of canker sores, vitamin B-12 deficiency is only one cause, and it's found to be an effective treatment. I don't believe vitamin deficiency is included in a standard CBC (complete blood count) test.
Vitamin B-12 deficiency common early symptoms are tiredness or a decreased mental work capacity, decreased concentration and decreased memory, irritability and depression.
Vitamin B-12 & Canker Sores 
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