....and they are pretty right if we talk about subclinical deficiency. Actually livestock are touched, fish like salmon (very new, article from 2020), also involved in bee's collapse.It's safe as in non-toxic.
Hormones Matter is a website full of info on this. But it's very "we're all deficient in thiamine". Still very useful.
Then wild moose tested deficient...
It comes from what blocks microbes synthesis, lack of ruminant manure, ruminants fed grains and switching to thiaminase synthesis... Glyphosate is implicated too because it favors blue green algae... also synthesizing thiaminase!
They have a FB group, understanding mitochondria nutrients, and there is a specific "thiamine (vitamin B1) deficiency" fb group too.