B12 does not have be sublingual. Taking a high oral dose, will be absorbed passively (without intrinsic factor) thru the intestines, provided there is no food present with it.
Many people believe taking a complex is best. Some of them work with others as cofactors. Riboflavin is needed for activating pyridoxine, for example. I think P5P needs to be enteric coated, but not the others. The reason is the phosphate will be cleaved off in the present of acid, and it will revert back to pyridoxine.
P5P is a cofactor for making serotonin in the brain. So people do feel better when that is fixed when low.
People with really low B6 may have a condition called pyroluria.
http://www.drkaslow.com/html/pyroluria.html
If this is the case for you, you may need zinc as well.
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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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