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Fibromyalgia Action UK
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Hi . I have fibro. I also had bariatric surgery nearly 2 years ago. They keep an eye on my b12 levels as it is a side effect of the surgery. My levels started at over 500 but have come down to 150. My doc will not give me any booster cos she said I am still within normal levels. I was under the impression that if u are below 200 then u should have booster injections but she said it is below 140. Do u know which is correct

5 Replies

I don't know the answer to this however you are entitled to seek a second opinion, I think you should.

Best wishes. Lou xx


Hi juliekp

I have taken this extract from livestrong and it may answer your question for you:

Normal Levels

Your doctor can measure your vitamin B12 levels through a blood test. Because of the general safety of the vitamin, upper limits for normal intake do not exist. If your blood values for the vitamin fall below a range of 170 to 250 picograms per milliliter, you may develop a B12 deficiency. However, blood tests do not necessarily accurately reveal the presence of a deficiency -- testing levels of a substance called methylmalonic acid may give a better picture of potential B12-related problems.

Here is the link to the rest of the information:


I want to wish you all the best of luck with this issue.

All my hopes and dreams for you



Hi Ken. Thank you very much for your help


Hi I had the surgery six years ago and have B12 injection every 10 weeks I always know I'm due feeling really tried hope this helps u


Yes thank u. My doc says that the b12 levels for my area (dont understand why where I live matters) is below 140. I am due for my last follow up appointment in march . I am feeling all the symptoms of it being low but doc wont do anything yet


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