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Many mild side effects are local and brief, but repeated injections over years are poorly characterized in the literature
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You can find more research on B12 deficiency risks and dietary sources
Pernicious anemia is an autoimmune disease that makes it hard for the small intestine to soak up B12
5. Supports Brain and Nerve Health 5. Supports Brain and Nerve Health Low vitamin B12 can affect nerve function, leading to tingling or numbness
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