@Eastman Thanks for the links. Those are to improvements in cognitive or mental states but I feel thiamine is doing far more than that. I half-wondered if cells get so disordered that
lactic acid builds up because I recall thiamine being very useful for that.
Your links also mention lithum. I read Yasko advocate taking lithum for B12 problems. I ordered lithium orotate but then discovered I couldn't find anything to support the use of lithium for B12 and have never got round to trying it.