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They are typically administered subcutaneously or intramuscularly depending on the product and treatment plan
B12 absorption occurs primarily in the terminal ileum via intrinsic factor-mediated uptake, with approximately 1% absorbed through passive diffusion at high doses
A person may experience peripheral sensory neuropathy due to vitamin B6 toxicity, for example, which most commonly causes numbness in the extremities (3)
Treatment of progressive multiple sclerosis: What works, what does not, and what is needed
2024, ods.od.nih.gov/factsheets/VitaminB12-HealthProfessional/
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