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Hi, Dr. Mo here with JA. Please let me review the information and I'll reply shortly.
The main vitamin B deficiency is B12 so we test for B12 deficiency.
there is blood test that you can do and it checks your B12 level. It's incredibly rare to be deficient but the blood test can check for it. We also always test for folic acid levels at the same time we test for B12 level.