Mold, Mycotoxins, and Your Genes: Detox Pathways, Symptoms, and SNPs

Key takeaways:

Mycotoxins are toxic metabolites produced by certain types of mold, and they can cause health effects at very low exposure levels.
We are regularly exposed to low-level mycotoxins, and the body has detoxification pathways to eliminate these toxins.
Common genetic variants in detoxification and response genes – such as CYP1A2, CYP3A4, GSTM1, GSTA1, GSTP1, UGT1A1, XPC, GSDMB, and IL13 – can increase susceptibility to mitochondrial damage, organ injury, or asthma from mycotoxins.
Knowing where your genetic susceptibility lies may help you target specific pathways to support mold and mycotoxin detoxification.

Members will see their genotype report below, plus additional solutions in the Lifehacks section. Join today.

Mold and Mycotoxins: Health Effects and Sources of Exposure

We are all exposed to mold on a daily basis. Fungi are essential to life: they live on our skin, make our soil fertile, and help decompose organic matter. But… some molds release microscopic toxins that can harm you. And for some people, exposure to certain types of mold can lead to long-term health problems.

Mold is a general term for the types of multicellular fungi that are filamentous. Yeasts are also fungi, but they are single-celled and don’t produce filaments. Exposure to certain types of mold – the kind that produces mycotoxins – can cause chronic health problems, gut health issues, immediate illness, mitochondrial dysfunction, or even death. When people talk about the health effects of mold, they are usually referring to the effects of mycotoxin exposure.

This article is part of the Genetic Lifehacks Detoxification hub, explaining how mycotoxins are metabolized and excreted, negative health effects of different types of mycotoxins, genetic variants that affect detoxification, and solutions for reducing mycotoxins in the body and your environment.

What are mycotoxins?

Mycotoxins are microscopic mold metabolites that can cause harm. They are naturally occurring toxins produced by filamentous fungi (molds). They are classified as toxins because even at very low doses, they can cause illness or even death in humans and other animals.[ref] Mycotoxins are different from the toxins found in poisonous mushrooms, which are the fruiting bodies of fungi.

Mycotoxins are found in trace amounts on moldy nuts, grains, coffee, and dried fruits. The mold that grows in damp places, such as water-damaged building materials, can also produce mycotoxins.

Aflatoxins, ochratoxins, trichothecenes, zearalenone, fumonisins, and ergotamine are more commonly studied mycotoxins, but more than 300 mycotoxins are known to exist. Some of these mycotoxins are produced by more than one type of fungus, while others are specific to a single fungal species.[ref]

The World Health Organization estimates that up to 25% of crops are contaminated with mold or fungal growth at some point in their life cycle. Some grains may have fungal problems in the field, while other products may grow mold during storage.[ref] Food processing methods reduce mold or mycotoxin contamination in foods that are used for human consumption. However, animal feed is more commonly contaminated with mold.

How are we exposed to mycotoxins?

Mycotoxins are produced by different types of fungi that grow on crops, in preserved foods, in damp homes, and in the soil, especially where warm and humid conditions are conducive to fungal growth.

The main routes of exposure to mycotoxins include:[ref]

Ingestion: Contaminated food and drink (nuts, grains, coffee, dried fruit)
Inhalation: Airborne spores in damp buildings
Dermal: Skin contact with moldy materials

Foods can be contaminated by mycotoxins either in the field or during drying, storage, and processing. Contamination with mycotoxins is more of a problem when agricultural processes and food handling procedures are poor.[ref] A 2026 study looked at 212 plant-based products from grocery stores in the UK, including plant-based meat alternatives and plant-based beverages. The researchers found that all of the products contained mycotoxins, and that plant-based meat alternatives had the highest levels.[ref]

Mycotoxins pose a dual problem:[ref]

They are toxic at extremely low levels
They are chemically stable, allowing them to survive cooking

Mold Exposure: Acute vs. Chronic

Exposure to mycotoxins can be either acute or chronic:

Acute exposure will result in rapid and severe symptoms of poisoning for someone who is exposed to higher levels of mycotoxins at one time (e.g., eating a bunch of moldy nuts).
Chronic exposure is more common. Exposure to very low doses over long periods of time can result in various health effects, including an increased risk of certain cancers.

Acute exposure from eating foods containing mycotoxins can cause symptoms of food poisoning. Researchers believe that a percentage of food poisoning cases each year are actually due to mycotoxins.

Chronic exposure to mycotoxins can come from food or a moldy environment. For example, mycotoxins often contaminate coffee beans and tea leaves at very low levels. Drinking contaminated coffee or tea every morning is one way we can be chronically exposed to trace levels of mycotoxins.[ref]

In addition, mycotoxins can be airborne and enter the lungs or pass through the skin. Homes, schools, and office buildings that have been water-damaged by flooding, roof leaks, plumbing drips, or AC condensation can develop mold in hidden places, leading to chronic mycotoxin exposure.

Recap: How do mycotoxins from mold affect health?

Mycotoxins are toxic compounds produced by molds, found in food and indoor environments.
Exposure can be acute or chronic (low-level, long-term), leading to a range of health effects.
Individual susceptibility to negative health effects varies based on genetic differences in detoxification pathways.

Specific mycotoxins: Dive into the details

Mycotoxin is a general term for many different types of toxins, and people are unique in how their bodies process and eliminate the different types of mycotoxins.

Genetic variants in the detoxification genes mean that some people may have little or no problem with mycotoxin exposure, while others may be very sensitive to low amounts of specific mycotoxins. Understanding the different types of mycotoxins, along with understanding your genes, may help you to identify what may be a problem for you.

Let’s take a look at several specific mycotoxins and what they do in the body:

Ochratoxin A
Zearalenone
Aflatoxin A and B1
Trichothecene
Fumonisins
Ergot alkaloids
Deoxynivalenol
Patulin

1) Ochratoxin A is produced by Aspergillus and Penicillium sp. Ochratoxin A is toxic and thought to be carcinogenic, especially in the kidneys and liver.[ref]

Ochratoxin A is found in cereals, coffee, wine, dried fruits, beer, and grape juice. It is also found in animal organs (kidneys, liver) of grain-fed animals. In humans, ochratoxin A can have a severe immunosuppressive effect at low and high exposure doses. Ochratoxin A also alters the absorption of nutrients in the intestines. Animal studies show that ochratoxin A can decrease dopamine levels, pointing to a role in neurological disorders.[ref][ref][ref][ref]

2) Zearalenone is produced by Fusarium species that grow on corn or other grains.[ref] It can bind to estrogen receptors (mimics estrogen) and is a reproductive toxin in animal studies. In addition, zearalenone is toxic to the liver and causes cell death.[ref] One study describes zearalenone as: “a non-steroidal compound that exhibits oestrogen-like activity”.[ref]

3) Aflatoxins are produced by a couple of different Aspergillus species. There are 18 types of aflatoxins, with aflatoxin B1 being one of the most toxic and carcinogenic.[ref]

Aflatoxins are commonly found in peanut products and sometimes in milk from cows fed with contaminated grain. Aflatoxin B1 is also found in cottonseed oil.[ref] Aflatoxicosis is the medical term for acute aflatoxin exposure that leads to liver damage, jaundice, and, in severe cases, death.[ref] Chronic dietary exposure to aflatoxins is one cause of liver cancer.[ref]

Aspergillosis is a lung infection caused by Aspergillus infections in the lung. This mainly occurs in immunocompromised people or people with chronic lung conditions.[ref][ref] Aspergillus infection in the lungs or respiratory tract secretes aflatoxins. These aflatoxins then impair the airway cilia from functioning correctly, leading to reduced mucosal clearance.[ref]

4) Trichothecene mycotoxins encompass about 100 subtypes of metabolites from Fusarium species. Trichothecenes can contaminate corn, wheat, barley, oats, rice, rye, vegetables, and other crops. They are a common cause of poisoning in animals eating contaminated feed. Trichothecenes are easily absorbed and then distributed throughout the animal’s tissues. Human exposure comes from consuming meat, milk, and eggs from animals fed contaminated grains.[ref]

Consumption of trichothecene-contaminated foods can cause gastrointestinal issues. This mycotoxin affects actively dividing cells, such as those in the intestinal or oral mucosa, and causes cell death.[ref]

5) Fumonisins are metabolites produced by Fusarium and Aspergillus fungal species that are frequently found on peanuts, corn, and grapes. In addition, fumonisins have been found on sorghum, white bean, barley, soybean, rice, black tea, and even medicinal herbs. Fumonisins are one of the most common mycotoxins in food products, with the World Health Organization estimating that 50% of corn products are contaminated worldwide. A survey of 29 US beer brands found that 86% had fumonisin contamination. Certain fumonisin subtypes are linked to an increased risk of esophageal cancer, and in general, fumonisins are considered a class 2B carcinogen.[ref][ref][ref]

Folate transporter blocker: An interesting observation by researchers is that fumonisins reduce folate uptake in cells. Folate is essential in developing babies, and without enough folate at the right time, babies can develop neural tube defects (e.g. spina bifida). Decades ago, researchers found that exposure to fumonisins before or during pregnancy increases the risk of neural tube defects due to a lack of folate. More recently, studies show that fumonisins cause a reduction in both types of folate transporters (FOLR1 and reduced folate carrier, which moves folate into cells). Folate receptor expression was reduced by 43% due to exposure to fumonisin B1. [ref][ref][ref]

Related article: Folate transporter gene variants

6) Ergot alkaloids are compounds created by Claviceps species, which are fungal pathogens that attack grasses such as rye. Ergot poisoning has been known for centuries. It was described as a “slow nervous fever” that occurred in the summer after a wet winter in the Middle Ages and was called St. Anthony’s fire. The symptoms recorded throughout history include convulsions, sores, hallucinations or mania, headaches, nausea, gangrene, and burning extremities.[ref] Modern grain processing methods eliminate ergot as a problem in human food sources, but it can still affect animals that graze on grasses or contaminated grains.[ref] The neuroactive components in the ergot alkaloids are similar to precursor molecules for LSD. Interestingly, a couple of Parkinson’s drugs are derived from ergot.

7) Deoxynivalenol is a mycotoxin produced by Fusarium species. It is found in wheat, beans, and some spices. Deoxynivalenol causes severe gastrointestinal issues similar to food poisoning when consumed via contaminated foods.[ref]

8) Patulin is a mycotoxin produced by Aspergillus, Penicillium, and Byssochlamys sp. It is most often found on apples, but can also occur on other moldy fruits or grains. The biggest dietary source is apple juice made from apples that aren’t fresh. Patulin can cause gastrointestinal problems and also organ damage.[ref] Patulin binds to thiol groups found in the intracellular antioxidant glutathione, which then causes oxidative stress, mitochondrial dysfunction, and cell death.[ref]

Health effects of mycotoxins: Mold illness symptoms and genetics

Exposure to mycotoxins can produce various physical responses — depending on the toxin, exposure route, amount, and individual genetic differences. Here’s what research shows:

Mitochondrial dysfunction:
This mycotoxin can impair mitochondrial function and inhibit the synthesis of certain proteins.[ref] Even at very low levels, mycotoxins, such as aflatoxin, can cause mitochondrial dysfunction and cell death. In the mitochondria, mycotoxins can cause disruption in the respiratory chain, decreasing the production of ATP and leading to chronic diseases.[ref] Some mycotoxins, such as patulin, can bind to thiol groups in glutathione, thus decreasing this essential cellular antioxidant. Without enough glutathione, oxidative stress and mitochondrial dysfunction.[ref]

Related article: Glutathione genes

Lung inflammation:
An inflammatory response occurs when lung tissue is exposed to airborne trichothecenes. IL-1β increases in a manner dependent on NLRP3 activation.[ref] Aflatoxin G1 airborne exposure significantly increases inflammation in the lung. [ref] Stacchybotry chartarum, also known as black mold, produces trichothecenes that can enter the lungs and cause inflammation and allergic symptoms.[ref]

Related article: Asthma genes

Organ damage and cell death:
From airborne exposure to fungi, the mycotoxins can travel from the lungs to the liver, kidneys, and spleen. Mycotoxins can cause inflammatory cytokines to increase in all of these organs. Specifically, researchers found higher levels of IL-1β, IL-6, and TNF-alpha.[ref] Genetic variants can influence how strong the inflammatory response may be. For example, TNF-alpha variants may cause some individuals to produce more of this cytokine in response to a mycotoxin. The overactive immune response then causes more cellular damage, exacerbating the problems from the mycotoxins.

Suppressed immune response:
Zearalenone is a mycotoxin that suppresses the normal inflammatory response that cells should produce against pathogenic bacteria. Zearalenone exposure tamps down the proinflammatory cytokines (TNF-alpha, IL1B, IL6) that should be produced in response to gram-negative bacteria. This ‘tamping down’ suggests a reduction in the innate immune response, which could leave someone vulnerable to infections after exposure to zearalenone.[ref]

Kidney damage:
Oral exposure to ochratoxin A from contaminated food is linked to kidney injury. Animal studies show that ochratoxin A increases inflammatory cytokines and upregulates genes related to fibrosis in the kidneys. Blocking NLRP3, an inflammatory activator, was able to suppress the kidney injury.[ref] Patulin is also known for causing kidney damage. The mechanism of action here seems to be mitochondrial damage and lack of ATP — kidney cells use a lot of ATP. [ref]

Gut microbiome interaction:
Exposure to mycotoxins through foods can impact the gut microbiome in several ways. First, some gut microbes can metabolize mycotoxins, sometimes creating more toxic metabolites. Mycotoxins can also impact the composition of the gut microbiome by killing off some bacteria and affecting gut barrier function. Interestingly, certain mycotoxins affect the way nutrients are absorbed.[ref][ref]

Related article: Gut mucosal barrier

Atopic dermatitis (eczema):
Long-term exposure to visible mold during infancy increases the risk of atopic dermatitis in children.[ref]

Asthma:
Many epidemiological studies link childhood asthma to mold exposure.[ref] One study looked at the interaction between genetic variants linked to asthma and mold exposure. In children exposed to visible mold, such as on the ceiling, there was a threefold increased risk of asthma when taking into account genetic variants and mold exposure.[ref]

Genes involved in mycotoxin detoxification

We are all regularly exposed to mycotoxins at trace levels, and our bodies have ways of getting rid of mycotoxins. The key is to not overwhelm the detoxification system through either an excess of toxins or by not having enough of the cofactors needed for detoxification.

In general, the body breaks down and eliminates toxins in three steps: phase I detoxification (CYP450 genes) makes the substance more polar; phase II detoxification (UGTs, GSTs) makes the metabolite water-soluble; and phase III is the excretion of the metabolite.

Detox Phase	Main Genes/Enzymes	Function
Phase I	CYP450 (CYP1A2, CYP3A4)	Makes toxins more polar/reactive
Phase II	UGT, GST, SULT	Conjugates toxins for excretion
Phase III	Transporters (ABCs)	Excretes water-soluble metabolites

Let’s look at some of the detoxification pathways involved in mycotoxin elimination:

Aflatoxin detoxification:
Aflatoxin can be combined in the body with glutathione, making it easy for the body to excrete. Having enough glutathione available to handle mycotoxins is essential, and the GST family of genes is important here.[ref]

Ochratoxin A:
Exposure to ochratoxin A increases oxidative stress. It can be counteracted on a cellular level by the Nrf2 pathway, which is necessary for upregulating genes that combat reactive oxygen species.[ref]

Zearalenone:
Glucuronidation is a phase II detoxification process by which a glucuronic acid molecule is added to a toxin to make it more easily excreted and less reactive. Zearalenone mycotoxins are excreted via the glucuronidation pathway, specifically utilizing UGT1A1, UGT1A3, and UGT1A8.[ref]

Additionally, methylation, hydroxylation (addition of a hydroxyl group), hydrolysis, and sulfation reactions are utilized for transforming mycotoxins for excretion from the body.[ref]

Table: Major Mycotoxins, Sources, Health Effects, and Detoxification Pathways

Mycotoxin	Main Sources	Health Effects	Pathways/Genes
Ochratoxin A	Cereals, coffee, wine, dried fruits, animal organs	Carcinogenic (kidneys/liver), immunosuppression, nutrient absorption issues	Nrf2 pathway, GST, UGT
Zearalenone	Corn, grains	Estrogenic, reproductive toxicity, liver toxicity	UGT1A1, UGT1A3, UGT1A8
Aflatoxins	Peanuts, milk, cottonseed oil	Liver damage, cancer, immunosuppression	GST, CYP1A2, CYP3A4, XPC
Trichothecenes	Corn, wheat, barley, oats, animal products	GI issues, cell death, immunosuppression	CYP450, GST
Fumonisins	Corn, peanuts, grapes	Esophageal cancer, neural tube defects, hepatotoxic	Folate pathways, CYP450
Ergot Alkaloids	Rye, grains	Neurological symptoms, gangrene, hallucinations	CYP450
Deoxynivalenol	Wheat, beans, spices	GI issues, cell death	GST, UGT
Patulin	Apples, apple juice, fruits	GI problems, organ damage, oxidative stress	Glutathione, GST

Mold Genes: Are the HLA types in 23andMe?

I want to take a moment to do a bit of ‘myth busting’ here. One question that I get asked fairly often is how to find the mold genes in 23andMe data. There is a lot of confusion and oversimplification being promoted on the internet about mold genes (often promoted by practitioners selling tests and supplements).

Some health influencers write about mold genes and refer to certain HLA types (HLA-DRB1, HLA-DRB3, HLA-DRB4, and HLA-DRB5). These HLA types are common — found in over a quarter of the population. About 25 years ago, practitioners found that people with these HLA types were over-represented in having mold reactions. They described symptoms of mold illness as fatigue, muscle pain, headaches, sinus problems, vision problems, brain fog, mood swings, vertigo, joint pain, weakness, and more.

The only published research on the HLA genes and mold symptoms is in the form of a couple of case studies.[ref][ref] While these HLA types could increase the immune system reaction to mold exposure, the only peer-reviewed studies on this just show a link between asthma, HLA types, and mold sensitivity in children.[ref]

Does a lack of peer-reviewed research mean that people don’t really have mold illness? Of course not. Clinicians make valid discoveries about health all the time, and not everything is written in a peer-reviewed journal. However, on Genetic Lifehacks, I just explain what high-quality research studies show.

How do genes affect mycotoxin detoxification?

Research on “mold genes” is much more granular than the broad HLA-based claims. Instead of a single “mold gene,” studies point to multiple detoxification and response pathways that each modulate risk for specific mycotoxins, depending on both the exposure level and the genetic variants you carry. Most of the research falls into three categories: phase I and phase II detoxification genes, DNA repair pathways, and genes that modulate inflammatory or respiratory responses to mold and mycotoxins.

Phase I and II detox genes: conversion and excretion speed

Phase I CYP450 enzymes – especially CYP1A2 and CYP3A4 – convert aflatoxins and other mycotoxins into more reactive intermediates that are water soluble. These metabolites then must be conjugated and excreted by phase II enzymes such as GSTs and UGTs. Variants that reduce CYP activity can slow initial metabolism, but if phase II is also impaired, reactive metabolites can still accumulate and damage DNA, mitochondria, and tissues like the liver and kidneys.

CYP1A2 and aflatoxin B1:

CYP1A2 is one of the key enzymes that bioactivates aflatoxin B1, turning it into an epoxide that can damage DNA. Decreased-activity CYP1A2 alleles are associated with reduced metabolism of aflatoxin B1. People with lower CYP1A2 activity may generate reactive aflatoxin metabolites more slowly (could be a good thing), but they can still be vulnerable if downstream conjugation pathways (GSTs, UGTs) are also compromised.[ref]

CYP3A4 and aflatoxin G1 / other mycotoxins:

CYP3A4 is involved in the metabolism of aflatoxin G1 and many other compounds, including medications. Decreased-function alleles reduce phase I clearance capacity for aflatoxin. Sulforaphane-rich cruciferous vegetables have been shown to modulate CYP3A4 activity and enhance aflatoxin B1 detoxification, which is particularly relevant for individuals with reduced-function CYP3A4 or GST/UGT variants.[ref][ref]

On the conjugation side, phase II enzymes determine how quickly reactive mycotoxin intermediates are neutralized and excreted from the body:

GSTM1, GSTA1, GSTP1 and aflatoxins/ochratoxin A:

Glutathione S-transferases (GSTs) help add glutathione to mycotoxin metabolites, including aflatoxin B1 and ochratoxin A. The common GSTM1 null genotype is linked to a higher risk of several cancers and to increased liver cancer risk when aflatoxin exposure is high — such as with frequent peanut or peanut butter consumption. [ref]

UGT1A family and estrogenic mycotoxins (zearalenone, ochratoxin A):

UGT1A1, UGT1A3, and UGT1A8 enzymes glucuronidate zearalenone, reducing its estrogenic activity and promoting excretion from the body. Genetic variants that reduce UGT1A1 activity can slow glucuronidation and potentially prolong the negative effects on the endocrine system and liver. Glucuronidation also contributes to ochratoxin A detoxification, so UGT variants may have an overlapping impact across several mycotoxins.[ref]

Patulin and glutathione-dependent pathways:

Patulin, a mycotoxin most commonly found in moldy apples and apple juice, binds to thiol groups in glutathione, depleting this key intracellular antioxidant and triggering oxidative stress and mitochondrial dysfunction. Efficient GST activity and adequate glutathione are thus important for neutralizing patulin.[ref]

Overall, combinations of slower CYP1A2/CYP3A4 alleles with reduced-function GST or UGT variants can leave someone more vulnerable at “normal” dietary exposure levels, because reactive mycotoxin intermediates may not be cleared efficiently.

DNA repair: XPC and aflatoxin‑related cancer risk

Once aflatoxin metabolites form DNA adducts, the worry shifts from detox pathways to DNA repair. The XPC gene, which encodes a key component of the nucleotide excision repair complex, helps recognize bulky DNA adducts and initiate repair. Studies show that the XPC variants are associated with increased DNA adduct levels after aflatoxin B1 exposure, increasing liver cancer risk.[ref][ref][ref]

This means that for people who both accumulate more DNA damage from mycotoxins (because of detox variants) and repair it less efficiently (because of XPC variants), the long‑term cancer risk from chronic exposure is significantly higher.

Respiratory and inflammatory response genes: mold, asthma, and lung reactions

Beyond direct toxicity, genes that govern airway inflammation and allergic responses help determine who develops asthma or strong respiratory symptoms in moldy environments.

GSDMB (ORMDL3) and mold‑related asthma:
Variants in the GSDMB/ORMDL3 locus are among the strongest common genetic risk factors for childhood asthma, and this region is highly expressed in bronchial epithelium. For example, studies show about a threefold increased risk of asthma in children with mold exposure when the risk alleles are present. In other words, the same level of mold in a classroom or damp home is much more likely to trigger asthma in children carrying GSDMB risk alleles.[ref]

IL13 and allergic responses to fungal exposure:
IL‑13 is a cytokine important in Th2‑type allergic inflammation, including asthma, allergic rhinitis, eczema, and allergic bronchopulmonary aspergillosis. The IL13 variants are linked to increased risk of aspergilliosis. Thus, in the context of moldy environments, IL13 variants do not change how mycotoxins are detoxified, but they change how vigorously the immune system responds in the airways.

Let’s take a look at how your genes specifically interact with mold and mycotoxins.

Mycotoxin Reaction Genotype Report:

This section covers genetic variants that modify the relative risk of negative effects from mycotoxin exposure. The information should be used to understand your specific susceptibility pathways, and should not be used to diagnose “mold illness”.

The table below summarizes key genes that influence how your body responds to mold and mycotoxins, the exposures they interact with, and why they matter clinically.

Gene	Main role in pathway	Key mycotoxins / exposures	Main health concern when variants present
CYP1A2	Phase I activation of toxins in the liver	Aflatoxin B1	DNA adducts, liver damage, cancer risk if phase II is insufficient
CYP3A4	Phase I metabolism of multiple toxins and drugs	Aflatoxin B1 and G1, other mycotoxins	Slower clearance of mycotoxins, higher liver burden, more reliance on GST/UGT pathways
GSTM1	Glutathione conjugation (phase II)	Aflatoxin B1	Higher liver cancer risk and damage at typical aflatoxin exposures (null genotype)
GSTA1	Glutathione conjugation; ochratoxin A detox	Ochratoxin A	Increased kidney and liver damage risk, higher asthma/allergy risk with low‑function alleles
GSTP1	Glutathione conjugation; oxidative stress handling	Aflatoxin B1, other electrophilic toxins	Greater liver damage and cancer risk with high aflatoxin exposure (reduced‑function variant)
UGT1A1 / UGT1A3 / UGT1A8	Glucuronidation (phase II) of estrogenic and other toxins	Zearalenone, ochratoxin A	Prolonged estrogenic and hepatic effects; reduced clearance of some mycotoxins
XPC	DNA damage recognition and nucleotide excision repair	Aflatoxin B1–DNA adducts	More unrepaired DNA damage and higher hepatocellular carcinoma risk in exposed individuals
SLCO1B1	Hepatic uptake transporter (phase III handling)	Aflatoxin B1	Increased susceptibility to aflatoxin‑related liver injury with risk alleles
GSDMB	Airway remodeling and hyperresponsiveness	Indoor mold / airborne mycotoxins	Higher childhood asthma risk and stronger airway response to mold exposure
IL13	Th2‑type allergic inflammation and IgE response	Aspergillus / moldy environments	Greater risk of asthma, allergies, and allergic bronchopulmonary aspergillosis
ADRA1A	Vascular tone and kidney blood flow	Patulin (especially from apple products)	Increased kidney vulnerability via reduced receptor expression and mitochondrial stress

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Lifehacks for Mold: Supplements, environmental factors

The big picture with mycotoxins is avoidance when possible, and then counteracting the negative effects of exposure.

Let’s look at multiple ways of doing this that are backed by research studies.

Avoiding mold contamination:

First up, let’s look at what research shows about environmental factors for mold exposure from what you eat, where you live/work, and the medications you regularly take.

Dietary sources of mold

In general, food production and storage are important in avoiding mold contamination, especially in humid climates. Here are some of the well-studied dietary sources to consider:

Peanuts and peanut butter: Peanuts grow where it is warm and humid. They are prone to fungal growth and are a big source of aflatoxin exposure.[ref][ref]
Pork products: Pigs that are fed grains contaminated with ochratoxin A are a dietary source of ochratoxin for people who regularly eat pork products.[ref] Many countries do periodic testing for contamination, so this isn’t a problem with all pork in all areas. However, this is a reason to choose high-quality pork or pork from a known local farmer when possible.
Your coffee maker: Research shows that the coffee pot reservoir and basket or pods with wet grounds are also sources of daily bacterial and fungal exposure. Aspergillus species thrive on caffeine.[ref][[ref][ref]
Bee pollen supplements: Pollen, such as bee pollen supplements, has been shown to harbor aflatoxins, ochratoxins, fumonisins, zearalenone, and other mycotoxins.[ref]
Grains: There’s more of a risk for mycotoxin contamination in grains that have been improperly stored. Most commercially available grains and flours are free of mycotoxins, but not all. For example, ConsumerLab.com found that Bob’s Red Mill Organic Whole Grain Buckwheat contained low levels of zearalenone.
Liver supplements (milk thistle): Often taken for liver health, 28% of milk thistle supplements were shown in one study to have a high concentration of mycotoxins.[ref]
Coffee: Older studies show that mycotoxin contamination was fairly common in coffee.[ref][ref] However, newer testing shows that many organic brands of coffee are both mycotoxin and pesticide-free. Tested brands included Peet’s, DeathWish, Bulletproof, and 12 more.[article] A 2022 study found that 28% of green coffee beans (not roasted) had ochratoxin A contamination, but only 4% of the roasted coffees contained mycotoxin.[ref]

Want to test a food or supplement yourself for mycotoxins? SimpleLab has an easy way to order tests (but it’s pricey!)

Check your home and office for mold:

Water damage is notorious for causing mold growth, and moldy buildings can be a continual source of airborne mycotoxin exposure. Look for leaking plumbing, water from an air conditioner condenser, or small roof leaks.

Here are a few studies on airborne mycotoxins in buildings:

A study in a school in Malaysia found that children had more headaches, runny noses, and tiredness when in classrooms with higher levels of mycotoxins in the dust.[ref]
School HVAC systems in the US are also a significant source of mold exposure.[ref]
HEPA filters in air purifiers are actually a source of the molds that can produce mycotoxins. A study found Aspergillus, Penicillium, Alternaria, Cladosporium, Trichoderma, and other fungal species in the filters after 6 to 12 months in homes.[ref]
Wallpaper that gets wet (such as in the bathroom) can easily grow mold, and moving air, such as from the bathroom fan, can easily aerosolize the mycotoxins.[ref]
Other wet building materials that support mold growth include Sheetrock, chipboard, and spruce wood.[ref] This is especially important in a building that has been flooded or had a plumbing leak.
Washing machines, especially around the lid/door and the detergent tray, can be a big source of fungal and bacterial biofilms.[ref] Sanitize your washing machine regularly — and while you’re cleaning, also run your dishwasher on a sanitize cycle and clean your coffee maker.
Mini split heat pumps can grow mold in them. Look into either an annual professional cleaning or search for videos on how to do a deep clean yourself.

Mold test kits are available online, and there are often local companies that specialize in mold testing. Testing may help you pinpoint which mycotoxin is causing your mold symptoms.

Cleaning up your environment:

While mycotoxins are resistant to extreme temperatures, UV light can eliminate them.[ref][ref] With mild-intensity UV light, zearalenone and deoxynivalenol are eliminated in an hour. More UV intensity breaks them down faster.

Ozone also breaks down or alters many mycotoxins to decrease toxicity.[ref][ref]

Drugs that may slow down detoxification:

Mycotoxins may be impossible to avoid completely, but most people have no problem with low-level exposure. However, if you are impairing your detoxification pathways with prescription medications, it could be adding to your mold problems.

UGT inhibitors include the drug class of kinase inhibitors[ref]
Clindamycin (antibiotic) inhibits GST enzyme activity[ref]

Quick Tips: Reducing Mycotoxin Exposure

Store food in dry, cool places to prevent mold growth.
Choose tested brands for coffee and peanuts.
Regularly clean coffee makers and washing machines.
Inspect homes for water damage and mold.
Consider genetic testing for detoxification gene variants if you have persistent symptoms.

Supplement to improve mycotoxin detoxification pathways:

Let’s look at how to target oxidative stress from mycotoxins in general, and then zoom in on the specific supplements and diet changes for genetic variants.

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Article Recap: Mold, Mycotoxins, and Your Genes

Mycotoxins are widespread environmental toxins with diverse health effects.
Genetic differences in detoxification pathways explain why some people are more sensitive.
Understanding your genetic profile can help tailor prevention and detox strategies.
Practical steps—food choices, home hygiene, and awareness—can reduce risk for everyone.

Mold, Mycotoxins, and Your Genes: Detox Pathways, Symptoms, and SNPs

Mold and Mycotoxins: Health Effects and Sources of Exposure

What are mycotoxins?

How are we exposed to mycotoxins?

Mold Exposure: Acute vs. Chronic

Specific mycotoxins: Dive into the details

Health effects of mycotoxins: Mold illness symptoms and genetics

Genes involved in mycotoxin detoxification

Mold Genes: Are the HLA types in 23andMe?

How do genes affect mycotoxin detoxification?

Phase I and II detox genes: conversion and excretion speed

CYP1A2 and aflatoxin B1:

CYP3A4 and aflatoxin G1 / other mycotoxins:

GSTM1, GSTA1, GSTP1 and aflatoxins/ochratoxin A:

UGT1A family and estrogenic mycotoxins (zearalenone, ochratoxin A):

Patulin and glutathione-dependent pathways:

DNA repair: XPC and aflatoxin‑related cancer risk

Respiratory and inflammatory response genes: mold, asthma, and lung reactions

Mycotoxin Reaction Genotype Report:

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Lifehacks for Mold: Supplements, environmental factors

Avoiding mold contamination:

Dietary sources of mold

Check your home and office for mold:

Supplement to improve mycotoxin detoxification pathways:

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Article Recap: Mold, Mycotoxins, and Your Genes

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