Fermented foods (such as tempeh), nori, spirulina, chlorella algae, and unfortified nutritional yeast cannot be relied upon as adequate or practical sources of B-12.39,40 Vegans must regularly consume reliable sourcesmeaning B-12 fortified foods or B-12 containing supplementsor they could become deficient, as shown in case studies of vegan infants, children, and adults
Other types, like hydroxocobalamin, might be used for different reasons
doi:10.3390/nu6051861
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This is the inactive form of vitamin B12 that requires the body to expend more energy to convert and remove a cyanide molecule than other forms of B12
they may adjust dose or frequency or recheck vitamin levels as needed