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The signs and symptoms of B12 deficiency that indicate you may benefit from vitamin B12 injections include: chronic fatigue, lethargy and weakness Muscle aches, joint pain and trouble exercising Poor memory, inability to concentrate and other cognitive problems associated with aging Mood changes, like increased depression and anxiety, or signs of nervousness like rapid heartbeats/palpitations Poor dental health, including bleeding gums and mouth sores Shortness of breath and feeling dizzy Poor appetite or digestive problems, like constipation, nausea, diarrhea or cramping Sometimes greater risk for problems like cardiovascular complications or even cancer (due to a rise in homocysteine levels) Why might you be low in vitamin B12, even if you eat a relatively healthy diet

Older adults : As we age, our bodies become less efficient at absorbing nutrients like B12, and deficiency is more common after age 60

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However, it can take several weeks for the full benefits to be realized, depending on the individual's level of deficiency and response to treatment.