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Nature Reviews Bioengineering
Graphical Abstract Access this article Similar content being viewed by others Data availability The data provided in the manuscript are available with the authors and could be shared when required
If deficiency or tissue utilization concerns arise, functional markers like methylmalonic acid (MMA) and homocysteine levels may offer additional context (source: Harvard T.H
& Kim, M
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Many foods are fortified with artificial vitamin B12, such as non-dairy milks and cereals, but these are not always optimally absorbed, so vegans must still be proactive about making sure they are not becoming deficient
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