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While dietary B12 requires Intrinsic Factor for absorption, high-dose supplements (such as 5000 mcg) rely on a process called passive diffusion
Legal status for personal use varies by jurisdiction
Your healthcare provider wants to understand when pain began, what makes it better or worse, and how it affects daily life
They work through different biological pathways and come from different sources, which is why, despite frequent mentions together, they are not interchangeable
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