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A doctor prescribes treatment if appropriate One of our doctors reviews your answers and pictures, and approves treatment or recommends the most suitable option for your health and needs

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

Competition for vitamin B12 by intestinal parasites or bacteria

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