I also have had bad IBS this morning - which I get from time to time, but of course think it's the new B12.

The brand of B12 has nothing to do with your GI upset. This is known as cause-and-effect thinking and it's the cogntive staple of persons with anxiety. In other words, people with anxiety are very quick to draw a relationship between to events if they occur within a reasonably close temporal context. Persons with IBS have a constant problem in that they eat a particular food and coincidentally experience an IBS flare-up. Subsequently, they now perceive this food product to be a "trigger" for their IBS and begin making rolling lists of food allergies which in actuality, never existed. This type of thinking is highly resistent to insight as well, with patients becoming stubbornly convinced because they steadfastly make the connection in their own mind and believe it to be factual.

I'd ask what your present B12 levels are? If you've actually been diagnosed with pernicious anemia, then you can consume all the B12 you can choke down and it won't resolve the problem. This type of anemia is the consequence of impaired GI absorption, so how would you expect for lingual B12 supplements to be effective in the absence of the known cause and its resolution?

Most pernicious anemia is observed in the elderly mainly because stomach acidity is reduced as aging progresses. Dietary indifference compounds the problem as well. Diminished acid formation in turn reduces intrinsic factor within the acid necessary for B12 to be absorbed. It is also a common occurrence among persons who have been on long-term proton pump inhibitor therapy, but not too frequent.

Pernicious anemia is treated by MI B12 so that it is directly absorbed into the bloodstream. As you'll recall from your A&P during your training, excess B12 is stored in the liver. Any type of anemia treatment needs to be accompanied by tests to determine levels every 90 days, with the first evaluation about 3 weeks following first replenishment to determine if resolution has occurred and being maintained.

So the brand is not the question here, but rather specifically what the origin of the deficiency was and if it was resolved, what the present B12 levels constitute? Consuming B12 in the absence of these factors is pointless because any excess above normal levels is not metabolized but merely stored and secondly, impaired absorption would not permit restoration via oral route.

Best regards and Good Health

My b12 level was 239 with a range of 200-900 by that lab.  
The dr. said no problem.   The rest of the blood work was 'stellar' his words.   No shots, just take a vitamin if I want.
Maybe he felt the high anxiety put a pull on my b12 levels.  I didn't have fatigue symptoms.

So I chose to take the sublingual b12 absorbed under the tongue right to the bloodstream.  

RLR.   do you think 239 is low.   I have no other health problems.   I am female 54 and post menopause from age 45 naturally.
Why do labs have different ranges, and why is the range so big.    If I look at 180-900, my 239 doesn't seem to bad.  

Thank you so much for your reply.  I received a call from the NP today stating that taking the B12 was optional.  I am surprised that the original MD stated that I would have to take it for life.  
I wonder why my levels got so low, along with the Vitamin D, and the up's and down's of the potassium?  At that time I was eating well and exercising.  Can IBS do this or stress?

The above were all normal when the B12 was low.