This can be rather complicated to predict:
Here are two sites with information:
http://www.tripanswers.org/answer.as...qid=5847&src=0
http://www.pubmedcentral.nih.gov/art...?artid=1554402
I would think further testing could help you be able to predict whether you will need B12 supplements or not.
I am getting ready for a long trip, and don't have much time to devote online this weekend. Sorry.
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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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