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Reported or proposed issue Pregnancy, breastfeeding, children, liver disease, or cancer history Evidence source No direct human safety data Known or theoretical
Current laboratory, animal, and early clinical research is encouraging and has not identified a consistent pattern of serious adverse events
That is why tests like methylmalonic acid (4) tend to be much more accurate than serum B12 levels
One key rule in healthcare preparation is to not substitute one for the other unless its explicitly safe to do so
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