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Results from B12 can be noticed as soon as 48 to 72 hours after treatment, with the duration of effects varying based on individual metabolic rates but typically lasting several weeks
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]
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If any symptoms persist or worsen, or you notice any other symptoms, please call your doctor
Most data are extrapolated from NNMT biology and animal work
Allergic reactions to proprietary preparations of vitamin B12 might be due to substances added to the solutions as preservatives or for other reasons, to impurities from the production, or to the vitamin B12 itself
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