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Complete our online health assessment, share any recent labs (especially B12 and folate if available), and connect with a licensed provider

Optic nerve atrophy can worsen in patients whose methylcobalamin levels are already elevated

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Summary B12 Amounts Versus B12 Activity Microbiological Assay R-protein Assay Intrinsic Factor Assay Intrinsic Factor Assay Shown to Be Unreliable in Humans Ochromonas Malhamensis Fares Better Than an Intrinsic Factor Assay Paper Chromatography Methods for Measuring B12 Activity of a Food Bacterial Contamination References Vitamin B12 in Plant Foods Summary Introduction Plant Foods with Practically No Detectable B12 Analogue Fermented Foods Mankai (Duckweed) Algae Seaweeds (Macroalgae) Various Seaweeds: Dulse Warrants Further Study Nori Vitamin B12 Analogue Content of Nori Species Nori ( Neopyropia sp