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Description
Absorption issues: Some people, particularly those with gastrointestinal disorders or aging adults, may have trouble absorbing vitamin B12 through the digestive system
People who have intrinsic factor get it from eating animal products but people with Pernicious Anaemia cannot absorb it from diet

Administration method depends on experimental design

Safety assessment of drug impurities for patient safety: A comprehensive review

I've also done a lot of research about PA since being diagnosed and I was a patient of one of the research consultants Mr Pritchard until last summer
