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nothing here is intended for human or veterinary use

10.1159/000337945 [DOI] [PubMed] [Google Scholar] 13

Beef liver contains 6080 micrograms of B12 per 100 grams, far exceeding beef muscle meat (23 micrograms), fish such as mackerel (1219 micrograms), eggs (0.6 micrograms each), and dairy milk (1 microgram per 200ml glass)
A blocked nasal passage reduces the surface area for absorption and weakens the delivery system Alternate Nostrils : Switch sides between doses
Energy Procedia 142 , 39984003

Of course, starting an at home B12 injection routine does require a prescription and proper training
