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If low levels of B 12 remain for a long time, the condition also can lead to irreversible damage to nerve cells, which can cause the following symptoms: numbness and tingling in the hands and feet difficulty walking muscle weakness irritability memory loss dementia depression psychosis

But, if you have a severe or chronic vitamin B12 deficiency, you may need repeated shots until the levels are replenished, followed by occasional maintenance shots

ISBN 978-1-4197-4296-5

You can learn more in our guide: Home Sweet Injection: How to Safely Give Yourself a B12 Shot

The risk increases with age, especially for adults over 60, as the bodys ability to absorb B12 naturally declines