I would like to share my story with you all:
Prior to my MS diagnosis I was taking a b12 tablet every single day. These made no difference to my symptoms whatsoever and I just kept steadily declining.
It was only once I started taking liquid b12 (and even more so after b12 injections) that my symptoms started to rapidly recede (blurred vision, brain fog, incontinence, balance, unable to sleep, heat intolerance etc etc).
I suffer from b12 malabsorption, which is why b12 tablets did not help me at all (it turns out that, due to a relatively common genetic abnormality, I am unable to absorb this vital vitamin through my gut).
I just want to share this with all of you, in case this information helps someone. I would have given anything to know about the possibility of b12 malabsorption at the time of my diagnosis :(
A very helpful book:
'Could it be b12' by Sally Pacholok
Very best wishes