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What is documented is different, and more serious

Should a patient start with 600mg or 1200mg

The stomach gradually produces less acid and intrinsic factor, and then the nutrients stop being absorbed appropriately

When B12 levels are insufficient, this protective coating can deteriorate, leading to improper nerve function and ultimately nerve damage

PLoS ONE 5 , e12244 (2010)

Low levels of B12 can lead to: Fatigue Weakness Digestive issues Shortness of breath Numbness or tingling in the fingers and toes Difficulty walking / balance problems Cognitive impairment or memory loss A person can also have low levels of vitamin B without exhibiting any obvious symptoms