Yep, though I'd imagine tablets won't address the deficiency for most of those.

Though you’re referring to those who require regular or semi regular injections—

As an aside to the larger topic I’ve a B12/iron and D deficiency. A combination of diet and tablet form supplement has been life changing.

Why? It has been accepted that oral supplementation is as good as injectable for a while now.

Most people who have B12 deficiency like my mother, are unable to absorb the oral form due to some type of malignancy. Injections are the only way to increase serum levels for her.

There are varying forms of oral B12 supplementation.

The sublingual kind does not involve the digestive system, it's absorbed diffusely at the mouth/throat. Jarrows makes them in methylcobalamin form.

Note however in my experience it caused painful neck stiffness after a week of use. But there were other positive effects observed, so it was definitely doing something. The lucid dreaming on the first couple days was quite interesting.

The methylated tablets work well. Methylation problems are very widespread