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They work through different biological pathways and come from different sources, which is why, despite frequent mentions together, they are not interchangeable
While dietary B12 requires Intrinsic Factor for absorption, high-dose supplements (such as 5000 mcg) rely on a process called passive diffusion
If you missed the previous two, check out How Long Does It Take to Become Vitamin B12-Deficient and What Are the Symptoms
However, this deadline could be extended, pending the outcome of ongoing court cases
How Does Half-Life Shape Injection Protocols and Frequency
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