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Always seek the advice of your physician or other qualified healthcare provider concerning questions you have before starting, stopping or modifying any treatment or medication
Even in healthy people, oral B12 absorption is only 5070% bioavailable
However, if youre highly deficient, you may feel tired for a short period as your body adjusts
If so, I strongly encourage learning to start differentiating between physical and emotional hunger
Yoshino J, et al
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