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A 300 mcg dose would be 12 units
Yet B12 deficiency is remarkably common, affecting vegetarians, vegans, older adults, and anyone taking certain long-term medications like metformin or proton pump inhibitors
But does it actually work
For example, people who follow vegetarian or vegan diets may have a higher risk of B12 deficiency because the vitamin is not naturally present in plant-based foods
Depending on patient needs and treatment objectives, these therapies could be given topically, orally, or via injections
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