Vitamin B12 Intake Needs
One of 108 insights in your Genomic Lifestyle Optimization Report.
B12 absorption efficiency drops with age, plant-based diets, and gut issues. Your intrinsic factor and transporter status predict whether you'll stay sufficient long-term, or quietly slide into deficiency that mimics aging and cognitive decline.
How your DNA shapes vitamin B12 intake needs.
TCN2 codes for transcobalamin II, the protein that carries vitamin B12 from blood into cells where it’s actually used. MTRR (methionine synthase reductase) keeps the B12-dependent methylation cycle running. VDR variants further shape B12 utilization through a connected receptor pathway.
Carriers of common TCN2 reduced-activity variants are associated with lower active B12 delivery to tissues, even when serum B12 looks adequate. Carriers of MTRR variants are associated with higher functional B12 demand. The picture often appears as "normal B12, persistent fatigue, brain fog, or neuropathy," because serum B12 reflects the total pool, not what’s reaching cells.
Methylcobalamin and adenosylcobalamin are the two active forms, used in different cellular roles. Cyanocobalamin (the cheapest supplement form) requires conversion. Sublingual or injectable forms bypass gut absorption issues that cyanocobalamin alone can’t address. Acid-blocking medications, metformin, and aging all reduce B12 absorption regardless of variant.
A "normal" serum B12 doesn’t always equal sufficient cellular B12. Which TCN2/MTRR pattern you carry, together with secretor status and gut health, decides whether food intake alone is enough or whether the active forms are the more useful supplementation.
In your report, Vitamin B12 Intake Needs is one dark card: a color marker set by your variants, the mechanism in plain language, and one practical next step.
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Water-Soluble Vitamins: the 8-insight cluster.
Vitamin B12 Intake Needs is one finding in a tightly related cluster. Mosaic reads the other 7 alongside it, so you see the whole biology, not an isolated data point.
About Vitamin B12 Intake Needs.
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Read insightThis is one of 108. Your report reads all of them, from one cheek swab.
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