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They concluded: Vitamin B(12) treatment, which is simple, inexpensive, and low-risk, seems to be effective for patients suffering from RAS [recurrent aphthous stomatitis, or canker sores], regardless of the serum vitamin B(12) level. That research was conducted quite a while ago

What are the current B12 blood level tests and how are they read

However, the extent of clinical testing differs between precursors

No crash
