@dockers Hm, just thoughts, no assumptions. stomach problems can lead to a reduction in or cessation of the production of ‘intrinsic factor’, and if there is too little of this, the body cannot absorb vitamin B12 (except for methylcobalamin, which can also be absorbed by passive diffusion if it reaches the gut in sufficient quantities). Stomach problems can also cause absorption to fluctuate even if a small amount of intrinsic factor is still being produced, and after prolonged gastrointestinal issues, the body’s own stores may be depleted. Just an idea, I’ve had my fair share of ‘the plague and cholera at same time’, so to speak – vitamin deficiency and nerve damage – and things are always better when at least the basics are ok. (deepl translated)