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In addition, B-12 shots reduce the risk of some serious complications associated with vitamin B-12 deficiency including: Heart disease Neurocognitive disorders Coordination problems (ataxia) Peripheral nephropathy Vision loss Infertility (although this usually resolves with B-12 treatment) Neural tube defects in the babies of women with B-12 deficiency

It also may hurt all the time, forcing you to cut your runs short

While a truly tolerance-free opioid has not been realized, differences have been noted in the tendency of various opioids to produce tolerance following repeated administration

Fast forward to more recent clinical interest in NAD+