I would say, 419 especially in a person with symptoms is low.
It is borderline normal, but "normal" according to old lab ranges.
I think you should supplement with 5mg of methycobalamin daily taken on an empty stomach. Get retested in 3 months, and discontinue several days before the blood draw.
See what you have then, if anything has improved or not.
You should be at a value of 1000pg/ml or higher by then. If you are above 1000pg/ml you
can try reducing to 1mg a day, or not --it is your choice. Some posters here stay at 5mg a day
anyway. I take 5 mg twice a week, because I remain high at that dose.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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