Not much gets thru the oral membranes... cobalamin is a huge molecule and hard to absorb.
Most of the sublingual dissolves in your saliva and you swallow it.
So take on an empty stomach for best results. This is why such a high dose is needed orally.
I have made a general informational thread about B12 here:
http://neurotalk.psychcentral.com/thread85103.html
Most of the new studies on oral tablets do not use sublingual.
Some of the sublinguals are hard little things...so chew those up and swallow.
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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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