Mold, CIRS & Chemical Sensitivity

Mold produces biotoxins that overwhelm detoxification pathways and sensitize the nervous system, creating the loss of tolerance (TILT) that opens the door to broader chemical sensitivity.

Water-damaged buildings produce a complex mixture of biotoxins including mycotoxins, endotoxins, beta-glucans, and volatile organic compounds. Within the CIRS framework, roughly a quarter of the population is estimated to carry specific HLA-DR genotypes that — proponents argue — leave the immune system less able to clear these biotoxins, so that instead of being processed and eliminated they recirculate and drive chronic inflammation. (This figure and mechanism come from the CIRS/Shoemaker literature and are not independently established in mainstream immunology — see the status note above.)

This chronic inflammatory state — Chronic Inflammatory Response Syndrome (CIRS) — can be the initial sensitizing event that opens the door to broader chemical sensitivity through the TILT mechanism. The mold exposure overwhelms detoxification pathways, sensitizes the nervous system, and creates the loss of tolerance that defines TILT’s Stage 1.

Many people with MCS find that their chemical sensitivities improve significantly after successful CIRS treatment and removal from mold-contaminated environments. This underscores the importance of identifying and addressing mold exposure as a root cause rather than treating chemical sensitivity symptoms in isolation.

Within its framework, CIRS is described as a multi-system inflammatory condition triggered by biotoxin exposure, defined by a specific set of biomarkers and an HLA-DR genetic association.

These biomarker and genetic criteria are defined by the CIRS research community and are not yet validated as a diagnosis in mainstream clinical guidelines.

Within the CIRS model, certain HLA-DR gene variants leave the immune system unable to “see” mold biotoxins — so they are never tagged for removal and keep recirculating.

The full mechanism — how HLA presentation works, why this is an immune identification problem rather than a liver problem, and what the one-time blood test measures — now lives on its own page: the HLA genetics deep dive →

What happens to biotoxins that cannot be cleared? They loop through liver, bile, and gut indefinitely — which is why people can leave a moldy building and stay sick for years. The recirculation mechanism, the documented clearance-rate case series, the full HLA haplotype categories table (multi-susceptible, mold-susceptible, post-Lyme, low-MSH), the MSH depletion cascade that disrupts sleep, pain, gut, and hormones, and MARCoNS — the biofilm-forming nasal bacteria that can put a ceiling on recovery — are all covered in depth on the science page: Mold Biotoxin Science →

The Shoemaker Protocol is a stepwise treatment sequence that bypasses the HLA genetic limitation by physically trapping biotoxins, eradicating secondary infections, and sequentially correcting downstream biomarker abnormalities.

Because the HLA genetic limitation cannot currently be corrected, the Shoemaker Protocol works around it. The protocol is sequential — each step must be completed before the next begins, because later steps depend on earlier corrections. Skipping steps or doing them out of order typically produces poor results.

Progress is monitored at each step using specific blood tests and Visual Contrast Sensitivity (VCS) testing. VCS is a neurological screening tool that detects subtle changes in visual processing caused by biotoxin-induced neuroinflammation. It is available as an online screening at survivingmold.com.

The International Society for Environmentally Acquired Illness (ISEAI) maintains a directory of practitioners trained in this protocol. Finding a practitioner experienced in CIRS is important — the protocol requires lab interpretation and dosing decisions that general practitioners are typically unfamiliar with.

If mold exposure is suspected as a cause of chemical sensitivity, the priority sequence is: test the environment, test yourself (HLA genetics and CIRS biomarkers), remove from exposure, and begin the appropriate treatment protocol.

Thinking about a hydroxyl or oxidant air device (like WellisAir) instead of, or alongside, remediation? See our honest look at air-cleaning devices and MCS before you buy.