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My B12 without supplements is just over 800. When I tested out the new Puritan's Pride methylB12 I tested at 1999 (the machine maximum).

If you don't convert well, the cyano form, OR if you don't take it on an empty stomach, I'd expect lower readings for you.

Cyano is still in most products, but some companies are now switching over to the active Methyl form.

So someone taking oral supplements would have to read the labels for dose (is it over 1000mcg/tablet), is it cyano?
And do you take it on an empty stomach.

Taking the right one the correct way should put you at 1000 or over for 1000mcg/day.

It superficially seems "easy" but the chemistry is quite complex in reality.