Calcium.
I dont think being on the bread line is useful when watching harrys farm https://www.youtube.com/watch?v=juXXt4ZHS-8&t=467s
or being in damp conditions.
https://en.wikipedia.org/wiki/Cladosporium#Health_effects
I can smell the mould in some brand new sliced bread and baps when its not out of date or anything visibly wrong with it.