It is best to get tested first. And if you are below 400, or hovering thereabouts, you could use B12 anyway... RSD or not.
You don't need injections, as oral active form works in high dose.
methylcobalamin 5mg orally on an empty stomach...for pennies a day.
My B12 thread explains all:
http://neurotalk.psychcentral.com/thread85103.html
Many doctors don't even know oral works. And many have never heard of active form methylcobalamin.
Many people on the boards here use it now.
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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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