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Other symptoms of vitamin B12 deficiency include: Rapid breathing or shortness of breath Headaches Indigestion Diarrhea Loss of appetite Problems with vision Feeling weak or tired Psychological problems, which can range from mild depression or anxiety to confusion and dementia Blood tests are the most common way to diagnose a vitamin B-12 deficiency
It was not based on our understanding now of how biology works
Tolerance has not been observed in clinical use
HUBERMAN: Of frankly, all tissues
Vegans and vegetarians: Since B12 is primarily found in animal products, supplementation is often necessary
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