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Inform your doctor if these side effects persist
B12 injections may also be useful for those with gastrointestinal issues, older adults, vegans, vegetarians, and people with underlying health conditions that can restrict vitamin B12 absorption
However, if you are deficient in B12, then supplementation may help improve symptoms like weakness and fatigue
The maintenance dose will then depend on whether your deficiency is related to diet or not
However, no peer-reviewed human clinical trials have been published to date
Injections, on the other hand, offer a more direct and potent alternative
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