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Main transport protein for B12 delivery to tissues.
| Genotype | Impact | What it means |
|---|---|---|
| CC (Normal) | Normal | Normal B12 tissue delivery |
| CG (Carrier) | Low impact | Reduced B12 delivery to peripheral tissues. Ensure dietary B12 from animal sources or consider methylcobalamin supplementation. |
| GG (Variant) | Moderate | Lower cellular B12 availability |
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