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Pen-injector specifics: Once you puncture a cartridge with a pen needle, most manufacturers rate the in-use shelf life at 28 days at 2 to 8 C
Simple things became difficult
When this happens, low levels of intrinsic factor produce symptoms of juvenile pernicious anemia in patients younger than age 10
Some people do not absorb B12 efficiently due to age, gastrointestinal issues, or insufficient intrinsic factor, a protein required for B12 absorption
We also recommend keeping the injection site clean and avoiding scratching or rubbing it to prevent irritation or infection
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