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For example, some people cannot absorb vitamin B12 properly through their intestinal tracts or have digestive problems that prevent them from absorbing the vitamin properly
You should start to see improvements within a few days to a week, however if you do not feel the effects after 2-3 injection sessions, then it is likely that you were and are not deficient in B12
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But having a low B12 level or a vitamin B12 deficiency can cause physical, neurological and psychological issues
However, this remains challenging for many obese individuals
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