b12 injectable for animals Troy Vitamin Injection – vet-n-pet DIRECT Vitamin B Vitamin B12 Injection (Nature Vet)

How long can AOD-9604 be used safely given its selective mechanism

It's safe for diabetics (though they should consult their doctor before use)

Diagnosed Deficiency or Malabsorption if you have a confirmed deficiency in a vitamin that affects appetite (like B1, zinc, or iron) or a condition that impairs nutrient absorption (such as certain digestive disorders or post-surgical states), vitamin injections can be highly beneficial

There is no one recommended vitamin B12 dosage for seniors

If you are having private injections on top of an NHS schedule, the combined frequency may be higher than either provider realises, which is worth flagging to both