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& Zechner, R
If B12 levels are low but still in range indicating a functional deficiency (this is a deficiency but blood tests appear in normal range) then second line testing of homocysteine and MMA can confirm B12 and/or folate deficiency
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None of the types of vitamin B, including thiamine (Vitamin B1), pyridoxine (Vitamin B6), niacin (Vitamin B3), and folic acid (Vitamin B9), can be stored by the body
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