HSSS
Expert
I was told over the phone that my level is 153, but I wasn't told the unit of measurement and didn't think to ask, I assume pg/ml though. I gather the NHS uses 190-200 as the minimum, which apparently differs according to local health authority (why?). So it's not dangerously low yet, and I have no symptoms as far as I can tell (dry mouth is a symptom but not of low b12).
Did your GP really say we don't store b12? That's pretty shocking if so. I read it takes up to 5 years to be depleted to a too-low level. Which corresponds well to my time on Metformin. Interestingly the leaflet in the Metformin box says low b12 is a very rare side effect, 1 in thousands, but elsewhere I read it affects up to 30% of long-term users. I've also read about people with low b12 with nerve problems, being misdiagnosed by ignorant GPs as having diabetic neuropathy. You really do have to educate yourself and then spoon-feed this info to GPs when necessary.
I am just wondering, supposing I need to keep taking Metformin, will methylcobalamin supplements increase my b12 levels sufficiently (or maintain them if I had to have injections first) or would the Metformin block that too? I wonder if a study has been done or whether I'd just have to try it and see.
My understanding was it reduced uptake % so if more is going in then more will be absorbed. Not sure if absorption via the oral mucosa has any effect over gastric absorption with regards to metformin though. I’m not nor have been on it.
Yes my understanding is that it takes years to deplete stores. His answer was it’s water soluble so peed out if in excess. He thinks it’s just come down to my personal running level. Ie my blood levels should be lower than I took it up to and therefore homeostasis kicked in I offloaded the excess. All I can do is try and keep blood levels monitored as I don’t think stores can be measured. I would assume each body finds and broadly maintains its natural level via dietary intake and top ups from liver storage only falling in blood serum when both sources are deficient.