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vegans, elderly) are suggestive of subclinical deficiency, and with borderline or low normal serum B12 when confirming a deficiency through numerous tests is not possible
Most people who receive a prescription for a B12 shot can buy vitamin B12 injections from their pharmacy self-administer the injection for themselves, provided they understand the safe way to do so
Fortified breakfast cereal Canned Tuna Rainbow Trout Clams Haddock Nutritional fortified yeast Care should be taken when considering B12 supplements as they may contain B12 analogue which cannot be used to satisfy dietary needs
Adducts (e.g., [M+2H]2+) are normal on LCMS reports
Supplementing it reverses some of that decline
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