I don't see how B12 can be massive orally.
A 1000mcg tablet yields 10 micrograms absorbed. The only thing massive is in the tablet itself, not what gets into YOU.
I typically recommend people get tested before taking B12.
It is good to know where to start.
And also the NIH and dietetic associations now recommend all people in US over 50 to take a B12 supplement. 30% will develop achlorhydria (low stomach acid) which will impair absorption from animal proteins.
And many have low acid from chronic use of the common acid blocking drugs, Zantac, Prilosec both OTC and other RX ones, like Nexium.
Also metformin depletes B12 in many patients too.
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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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