I found an article regarding transdermal patch with microneedle technology.
link.springer.com/article/1...
A promising technology to deliver medication in most effective, continuous and bioavailability fashion but there are some hurdles which must be eradicated first.
I think this technology can make lots of disorders and diseases history including pernicious anaemia, but still it's infancy stage.
Unfortunately I couldn't find yet regarding B12 yet.
Any comments?