There are many causes. Trouble is to pinpoint the right one. Also, people do vary on what's normal for them. So one needs to look at the symptoms more than the numbers ... not just in B12, but in blood pressure, cholesterol, iron, etc.
Symptoms are tricky too though, because many things will cause parallel symptoms.
I had totally normal (within normal range) on most everything they regularly test for, and still had a mild heart attack. Individuals vary, said the docs.
Symptoms are tricky too though, because many things will cause parallel symptoms.
I had totally normal (within normal range) on most everything they regularly test for, and still had a mild heart attack. Individuals vary, said the docs.