Mould ( in the UK) is also known as Mold in the USA . Damp and mould growth is classed as hazard alongside asbestos, lead and carbon monoxide in the UK the 2026 Government Housing Act Report , 'Housing Health and Safety Rating System (HHSRS)' (ref 1)

It's not the mould you can see that’s a problem, it’s the dead and airborne mould, bacteria and other “invisible” contaminated fragments & mycotoxins that you inhale which are considered the greatest health hazard.
 
The tiny spores can pass through the blood brain barrier cause metabolic chaos. Symptoms include – fatigue, brain fog and headaches. Increased sensitivity/ allergies

An estimated 25% of the western populations have allele variations in he HLA gene that mean they can’t eliminate mould efficiently ( ref 2)
 
There are various lab tests that cost £250-£700 to determine mycotoxins.
 
However the Visual Contrast Sensitivity test ( VCS)  is a an affordable proxy, for biotoxin accumulation. This is because biotoxins accumulate in the optic nerve and impair visual contrast ( black/ grey on white)
 
The VCS has low false positives ( around 98%) , high false negatives (around 10%)
Biotoxins removal gave me a massive step change in my NE/ CFS recovery
 
Below are my VCS test results.  Initially in 2017 where you can see my results ( red line) are considerable below the healthy populations response ( grey line).  I was exposed to mould as a child and remember it growing on the walls.
 
After following a fat cycling ketogenic protocol, to mobilise the toxins stored in the fat cells, we then used natural binders to pull the biotoxins out and allow elimination from my body.
 
In 2018, though still not a perfect trace, I felt substantially better with massive shift in my brain fog and general resilience to life

It took until 2019 to get full clearance, where now brain fog is happily a thing of the past