This distinction matters because exogenous GH administration carries a different risk profile than peptide-stimulated endogenous release
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
Microbial production of vitamin B12: a review and future perspectives
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Published Phase 2 studies lasted 12 or 24 weeks