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Its 28-day usability window after opening is specifically designed for this use case, and using sterile water in a multi-dose context introduces a real and unnecessary contamination risk with every additional needle insertion

Administer epinephrine immediately

The tool followed the decision tree in Supplementary Fig

If your body has trouble absorbing B12 from food or if you're not getting enough of it, these injections become especially helpful

Generally, B12 injections are administered every 3 to 7 days, in treatment cycles of 3 weeks or more, as recommended by the doctor

Extreme fatigue Weakness Tingling in hands and feet Memory problems Difficulty concentrating (brain fog) Pale skin Mood changes What food is highest in B12