neo b12 injection uses Benefits of Injections for Optimal Health B12 Shots: Benefits, Uses, Safety,
Description
Summary: Vitamin B12 injections after gastric banding are indicated when oral supplementation fails to correct a documented deficiency, neurological symptoms are present, or the patient cannot adhere to daily oral regimens

By the way, even if you dont have pernicious anemia, but a severe B12 deficiency due to other causes, B12 shots are still the way to go

Cats that do not respond appropriately to enzyme and cobalamin supplementation may have concurrent small intestinal disease, such as IBD [71]

A Guide to the Best Needles for B12 Injections Nearly 40% of Americans are deficient in vitamin B12