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Good sources of vitamin B12 include: meat salmon and cod milk and other dairy products eggs If you're a vegetarian or vegan, or are looking for alternatives to meat and dairy products, there are foods that are fortified with vitamin B12, such as some yeast extracts, breakfast cereals and soy products
[115] This functionality is lost in vitamin B 12 deficiency, resulting in an increased homocysteine level and the trapping of folate as 5-methyl-tetrahydrofolate, from which THF (the active form of folate) cannot be recovered
Bioavailability following subcutaneous injection is estimated at approximately 80%, substantially higher than oral administration, where peptide degradation in the gastrointestinal tract limits systemic exposure
Best choice: your provider can recommend the right option based on your B12 level, the cause of your deficiency, and your symptoms
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