Just to settle some minds here...

There is no upper limit for B12 dosing. There are no reported toxic effects from high doses.

In fact less than 10% of any dose is absorbed orally by passive diffusion. The lowest dose we use on PN board here is 1000mcg daily.

In US we have antiquated testing ranges. Here very low readings are considered "normal" when in fact they are not.
In other countries, people are treated with levels below 500 or so.

The various nutritional experts have recommended that all people 50 and over take a supplement for this vitamin since so many are low, and that being low contributes to neurological symptoms and deterioration.

People with intact intrinsic factor functioning, will absorb more than 10%. But today with acid reducing drugs etc, that function is not reliable.

So taking 1000mcg is not "dangerous". But not taking enough may be not effective.

We have a thread on PN here:
http://neurotalk.psychcentral.com/thread85103.html

Oral supplements of B12 should be taken on an empty stomach for best results.

Never be satisfied with "normal" from your doctor. Get the actual numbers! We see this error every day just about at the PN board here.
People being told they are "normal" when they are NOT.