can injectable b12 be taken orally Injections at Olympia B12 Injections vs Oral Supplements:

Testing and Prescribing Vitamin B12 in Swiss General Practice: A Survey among Physicians

Ampoule filling line: Aipak Ampoule Filling Line Ampoule filling line is fully automated equipment used to fill and seal vitamin b12 injection for cats in ampoules

Works well but is awkward to reach one-handed, so it is easier when a clinician or another person does it

Aliquot into single-use volumes and avoid repeated freeze-thaw cycles

The FDA may not approve these as there is insufficient high-quality human clinical evidence demonstrating safety and effectiveness as we would normally see in a Pre Clinical and Clinical Trial Ph 1-4 study