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The active ingredient is the same either way
However, the oral route cannot be excluded as it did not depend on intrinsic factors only, as the simple diffusion (without the need for intrinsic factors) is now considered another mechanism for the absorption of vitamin B12 [49, 50]
Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic Polymorphisms
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