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Low vitamin B12 levels are more common among those who: If youre experiencing troubling symptoms or believe youre at high risk for a deficiency, raise these concerns with a healthcare provider, who may decide that you should be tested
How to check for Vitamin B12 deficiency with lab tests: Serum Vitamin B12 levels: should be in the top 75% percentile of the lab reference range (yes even mid-range can still be too low)
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It is primarily found in animal products such as meat, fish, eggs, and dairy
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