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PubMed provides access to hundreds of research papers examining B12 absorption, deficiency risk factors, and supplementation strategies during weight loss

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

It is a single small aromatic molecule designed to be membrane-permeable, so in principle it can survive the gut and cross into cells