Most of the evidence giving rise to this claim comes from a few observational studies
The NIH Office of Dietary Supplements and the American Academy of Family Physicians identify the following groups as most vulnerable: Adults over 50 Age-related decline in stomach acid production reduces the ability to release B12 from food proteins
A significant driver of dysautonomia is small fiber neuropathydamage to the tiny, unmyelinated or thinly myelinated nerve fibers that control involuntary autonomic functions like heart rate, blood pressure, and digestion
Its naturally found in animal-based foods like meat, poultry, eggs, and dairy products
1 Deficiency is often due to a lack of B12 foods in the diet, absorption issues, and/or genetic mutations that affect uptake
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