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A healthcare professional can prescribe vitamin B12 intramuscular injections or nasal gel spray for people with a severe vitamin B12 deficiency
[1] The American Diabetes Association (ADA) primarily recommends B12 monitoring for patients on long-term metformin therapy rather than for those on GLP-1/GIP receptor agonists
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A single injection is the primary protocol, with a repeat at 6 weeks if needed
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