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When this happens, low levels of intrinsic factor produce symptoms of juvenile pernicious anemia in patients younger than age 10
When one shot a month didn't seem to be enough, I talked to my doctor and he suggested we try a shot every 3 weeks
B12 books I found useful "What You Need to Know About Pernicious Anaemia and B12 Deficiency" by Martyn Hooper Martyn Hooper is the chair of PAS (Pernicious Anaemia Society)
Vitamin B12 is a requirement your body needs to function properly, as well as the development of the brain, nerves, blood cells and so much more
doi:10.1210/endo.141.11.7873
An oversupply with cobalamin is also possible, for which there are pathological causes, for example
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