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Trends in Endocrinology and Metabolism (2017) 8
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But the type of B12 found in these foods is not biologically active, so it doesnt raise B12 levels in the blood
doi:10.1586/14789450.2014.965159
If your stomach struggles to produce enough stomach acid, injections are much better than oral supplements due to their bioavailability
NIST SRM definitions note that lot or issue identifiers can appear on certificates and help identify batch-produced or individually certified units [8]
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