No, because when you bypass the digestive system you bypass other normal pathways. It's never really so simple as just skipping the gastrointestinal system.
It's obviously not unheard of to get injections of this nature. Especially vitamin b-12. For instance if you have pernicious anemia which result from the lack of and "intrinsic factor" needed to absorb b-12. So the treatment would be a series of deep injections. But even then it would only be used to get the levels up to normal and then the levels would be maintained with big oral doses. A doctor would never keep someone on injections for long periods of time unless it was absolutely necessary.
Then there are gastrointestinal disordes. Chron's or Sprue for instance, that would require the same thing. But again oral doses would be used for maintenance after normal levels were reached. The levels would be monitored and injections would only be used again if they fell enough.
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