Good sources include: Meat (especially liver and kidney) Fish (salmon, trout, tuna, sardines) Shellfish (clams, mussels) Eggs Dairy products (milk, cheese, yoghurt) Fortified foods (breakfast cereals, plant milks, nutritional yeast) The recommended daily intake for adults is 2.4 micrograms
In the Phase 3 obesity trial, rates were about 5%, 12%, and 13% at 4, 9, and 12 mg
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In cases where B12 levels are borderline or clinical suspicion remains high despite normal results, additional tests may be valuable
Tissue-Level Interpretation Changes in body weight or adipose mass can result from altered food intake, hydration, lean mass, lipid synthesis, lipid mobilization, substrate oxidation, activity, thermogenesis, gastrointestinal effects, or tissue-specific adaptation